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PRODID:-//Nonequilibrium Quantum Workshop NQW - ECPv6.14.2//NONSGML v1.0//EN
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X-WR-CALNAME:Nonequilibrium Quantum Workshop NQW
X-ORIGINAL-URL:https://nqw.ijs.si
X-WR-CALDESC:Events for Nonequilibrium Quantum Workshop NQW
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X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Ljubljana
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
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BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T085900
DTEND;TZID=Europe/Ljubljana:20231212T101500
DTSTAMP:20260407T175621
CREATED:20231207T151408Z
LAST-MODIFIED:20231207T151436Z
UID:3126-1702371540-1702376100@nqw.ijs.si
SUMMARY:Chair: Jure Demsar
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-jure-demsar-2/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T090000
DTEND;TZID=Europe/Ljubljana:20231212T093000
DTSTAMP:20260407T175621
CREATED:20231201T190235Z
LAST-MODIFIED:20231207T151451Z
UID:2577-1702371600-1702373400@nqw.ijs.si
SUMMARY:Daniele Fausti: Cavity-Mediated Thermal Modulation ‌of the Metal-to-Insulator Transition in 1T-TaS2
DESCRIPTION:D. Fausti1 \n1University of Erlangen\, Germany \nThis seminar will focus on the potential of cavity electrodynamics in shaping material properties\, opened by on our recent investigation into cavity-mediated thermal control of the metal-to-insulator transition in 1T-TaS2\, which demonstrated the feasibility of reversible cavity manipulation of a phase transition in a correlated solid-state material. \nBy immersing the charge density wave material 1T-TaS2 into cryogenic tunable terahertz cavities\, we unveil a remarkable shift between conductive states. This transition\, triggered by a substantial alteration in sample temperature\, is controlled by mechanical adjustments of the distance between cavity mirrors and their alignment. \nThe discussion will extend to unpublished data on vibrational strong coupling within higher frequency cavities\, emphasizing the position-dependent coupling strength that underscores the influence of the mode structure on the observed effects. \nOur findings rationalized in a scenario reminiscent of the Purcell effects\, wherein the spectral profile of the cavity significantly shapes the energy exchange between the quantum material and the external electromagnetic field unfolds promising opportunities for tailoring the thermodynamics and macroscopic transport properties of quantum materials through strategic engineering of their electromagnetic surroundings. The seminar will discuss some perspectives for cavity control of material functionalities in correlated complex quantum materials.
URL:https://nqw.ijs.si/event/daniele-fausti-cavity-mediated-thermal-modulation-of-the-metal-to-insulator-transition-in-1t-tas2/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T093000
DTEND;TZID=Europe/Ljubljana:20231212T100000
DTSTAMP:20260407T175621
CREATED:20231201T190235Z
LAST-MODIFIED:20231207T151451Z
UID:2578-1702373400-1702375200@nqw.ijs.si
SUMMARY:Martin Eckstein: Light-matter hybrids made from strongly correlated electron systems
DESCRIPTION:M. Eckstein1 \n1University of Hamburg\, Germany \nEnhancing the light-matter coupling in cavities provides an intriguing avenue to control properties of matter\, from chemical reactions to transport and thermodynamic phase transitions. In this talk\, I discuss two mechanisms in which quantum light can influence extended condensed matter systems\, in particular strongly correlated electron systems: (i) The hybridization of light and matter can affect first-order metal insulator transitions\, because light selectively modifies the free energy of the metallic phase . This mechanism has been discussed in relation to the cavity-controlled metalinsulator transition in 1T-TaS2 [1]. While it most likely is not the relevant mechanism in this case\, we discuss other situations where it can be decisive. (ii) We discuss the possibility to induce photon mediated long-range interactions between spin and orbital degrees of freedom [2]\, which rely on the nonlinear light matter interaction (Raman scattering or two-photon absorption and emission). \n\nJarc et al.\, Nature 622\, 487 (2023)\nFadler et al.\, arXiv:2311.01339
URL:https://nqw.ijs.si/event/martin-eckstein-light-matter-hybrids-made-from-strongly-correlated-electron-systems/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T100000
DTEND;TZID=Europe/Ljubljana:20231212T101500
DTSTAMP:20260407T175621
CREATED:20231201T190235Z
LAST-MODIFIED:20231207T151451Z
UID:2579-1702375200-1702376100@nqw.ijs.si
SUMMARY:Federico Cilento: Ultrafast Dynamics of the Charge Density Wave in Kagome Metals
DESCRIPTION:F. Cilento1 \n1Elettra – Sincrotrone Trieste ScpA\, Strada Statale 14\, km 163.5\, Basovizza\, Trieste\, Italy \nThe Charge Density Wave (CDW) order\, descending from a metallic parent state\, offers an intriguing playground to study the interplay of structural and electronic degrees of freedom in complex materials. Recently\, this phenomenology has been discovered also in Kagome metals. With dispersive and correlation features including topological Dirac-like itinerant states\, van-Hove singularities\, correlated flat bands\, and magnetic transitions at low temperature\, kagome metals are located in the interesting regime where both phonon and electronically mediated couplings are significant. In particular\, the van-Hove singularities\, which are intrinsic to the kagome tiling\, have been conjectured to play a key role in mediating the CDW instability. However\, to date\, the origin and the main driving force behind this charge order is elusive. Here\, we use the topological bilayer kagome metal ScV6Sn6 as a platform to investigate this puzzling problem\, and combine time-resolved optical spectroscopy\, to unveil the ultrafast dynamics of its CDW phase\, with angle-resolved photoelectron spectroscopy and density functional theory [1]. We identify the structural degrees of freedom to play a fundamental role in the stabilization of charge order. In particular\, we find ScV6Sn6 to feature a charge density wave order that predominantly originates from phonons\, as odd with other recent findings on other kagome metals like those from the AV3Sb5 (A = K\, Rb\, Cs) family\, where the CDW originates from an electronic instability. As we shed light on the lattice-mediated low-temperature ordered phase\, our findings pave the way for a deeper understanding of ordering phenomena in CDW kagome metals. \n\nM. Tuniz et al.\, arXiv:2302.10699
URL:https://nqw.ijs.si/event/federico-cilento-ultrafast-dynamics-of-the-charge-density-wave-in-kagome-metals/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T101500
DTEND;TZID=Europe/Ljubljana:20231212T104500
DTSTAMP:20260407T175621
CREATED:20231201T195207Z
LAST-MODIFIED:20231207T151451Z
UID:2751-1702376100-1702377900@nqw.ijs.si
SUMMARY:Coffee Break
DESCRIPTION:
URL:https://nqw.ijs.si/event/coffee-break-5/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T104400
DTEND;TZID=Europe/Ljubljana:20231212T120000
DTSTAMP:20260407T175621
CREATED:20231207T151451Z
LAST-MODIFIED:20231207T151514Z
UID:3132-1702377840-1702382400@nqw.ijs.si
SUMMARY:Chair: Nelson Hua
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-nelson-hua/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T104500
DTEND;TZID=Europe/Ljubljana:20231212T111500
DTSTAMP:20260407T175621
CREATED:20231201T190235Z
LAST-MODIFIED:20231207T151453Z
UID:2581-1702377900-1702379700@nqw.ijs.si
SUMMARY:Michael Sentef: Light-Matter Control of Quantum Materials
DESCRIPTION:M.A. Sentef1 \n1University of Bremen and Max Planck Institute for the Structure and Dynamics of Matter\, Hamburg \nAdvances in time-resolved pump-probe spectroscopies have enabled us to follow the microscopic dynamics of quantum materials on femtosecond time scales. This gives us a glimpse into the inner workings of how complex\, emergent functionalities of quantum many-body systems develop on ultrafast time scales or react to external forces. The ultimate dream of the community is to use light as a tuning parameter to create new states of matter on demand with designed properties and new functionalities\, perhaps not achievable by other means. In this talk I will discuss recent progress in controlling and engineering properties of quantum materials through light-matter interaction [1\,2]. I will highlight work on Floquet engineering — the creation of effective Hamiltonians by time-periodic drives — on sub-cycle time scales [3\,4] combining theory and pump-probe experiments at the limits of energy and time resolution. I will then showcase recent theories on inducing superconductivity with light by employing enhanced light-matter interaction in the near-field involving polaritonic excitations [5\,6]. \n\nA. de la Torre et al.\, Rev. Mod Phys. 93\, 041002 (2021)\nF. Schlawin\, D. M. Kennes\, M. A. Sentef\, App. Phys. Rev. 9\, 011312 (2022)\nM. Schüler and M. A. Sentef\, https://doi.org/10.1016/j.elspec.2021.147121\nS. Ito et al.\, Nature 616\, 696-701 (2023)\, https://www.nature.com/articles/s41586-023-05850-x\nC. J. Eckhardt et al.\, arXiv:2303.02176\nS. Chattopadhyay et al.\, arXiv:2303.15355
URL:https://nqw.ijs.si/event/michael-sentef-light-matter-control-of-quantum-materials/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T111500
DTEND;TZID=Europe/Ljubljana:20231212T114500
DTSTAMP:20260407T175621
CREATED:20231201T190250Z
LAST-MODIFIED:20231207T151453Z
UID:2582-1702379700-1702381500@nqw.ijs.si
SUMMARY:James McIver: Ultrafast control of topological transport in quantum materials
DESCRIPTION:J.W. McIver1\,2 \n1Columbia University\, Department of Physics\, New York\, NY\, USA  \n2Max Planck Institute for the Structure and Dynamics of Matter\, Hamburg\, Germany \nQuantum materials exhibit remarkable non-equilibrium phenomena when driven by the strong fields in femtosecond laser pulses. Recent years have seen a surge of interest in using ultrafast light-matter interaction to create and manipulate photon-dressed Floquet-Bloch states as a strategy for controlling material properties. This excitement is fueled by the predictive power of Floquet theory\, which has been used\, for example\, to correctly predict the formation of topological edge modes in periodically-driven systems that exhibit no topological properties in equilibrium. Many of these proposals have been verified in quantum simulation settings\, but are only just beginning to be explored in solids. \nIn this talk\, I will present results on the electrical transport properties of quantum materials driven by mid-infrared laser pulses\, probed using an ultrafast optoelectronic device architecture. The talk will primarily focus on recent results obtained on the Weyl semimetal Td-MoTe2\, where a rectified\, helicity-dependent injection current that scales linearly with the applied laser field was observed. This scaling violates the perturbative description of nonlinear optics/transport\, which demands a quadratic field scaling for current rectification to occur. The results can be explained using Floquet theory\, which predicts that the observed linear scaling arises from the stimulated emission that accompanies the hybridization of Floquet-Bloch states.
URL:https://nqw.ijs.si/event/james-mciver-ultrafast-control-of-topological-transport-in-quantum-materials/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T114500
DTEND;TZID=Europe/Ljubljana:20231212T120000
DTSTAMP:20260407T175621
CREATED:20231207T151453Z
LAST-MODIFIED:20231207T151453Z
UID:3133-1702381500-1702382400@nqw.ijs.si
SUMMARY:Sourav Nandy: Emergent dipole moment conservation and subdiffusion in tilted chains
DESCRIPTION:S. Nandy1 \n1Jožef Stefan Institute\, SI-1000 Ljubljana\, Slovenia \nI plan to talk regarding the transport dynamics of an interacting tilted (Stark) chain\, based on our recent work [1]. In this work\, we have shown that the crossover between diffusive and subdiffusive dynamics in such a system is governed by F√L\, where F is the strength of the field\, and L is the wave-length of the excitation. While the subdiffusive dynamics persist for large fields\, the corresponding transport coefficient is exponentially suppressed with F so that the finite-time dynamics appear almost frozen. Our work explains the crossover scale between the diffusive and subdiffusive transport by bounding the dynamics of the dipole moment for arbitrary initial state. We also prove its emergent conservation at infinite temperature. Consequently\, the studied chain is one of the simplest experimentally realizable models for which numerical data are consistent with the hydrodynamics of fractons. \n\nS. Nandy\, J. Herbrych\, Z. Lenarčič\, A. Głódkowski\, P. Prelovšek\, M. Mierzejewski\, (2023)\, arXiv:2310.01862 [condmat.str-el].
URL:https://nqw.ijs.si/event/sourav-nandy-emergent-dipole-moment-conservation-and-subdiffusion-in-tilted-chains-2/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T120000
DTEND;TZID=Europe/Ljubljana:20231212T131500
DTSTAMP:20260407T175621
CREATED:20231201T195222Z
LAST-MODIFIED:20231207T151453Z
UID:2752-1702382400-1702386900@nqw.ijs.si
SUMMARY:Lunch
DESCRIPTION:
URL:https://nqw.ijs.si/event/lunch-6/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T131500
DTEND;TZID=Europe/Ljubljana:20231212T163000
DTSTAMP:20260407T175621
CREATED:20231201T190250Z
LAST-MODIFIED:20231207T151453Z
UID:2584-1702386900-1702398600@nqw.ijs.si
SUMMARY:Free time / Poster Session
DESCRIPTION:
URL:https://nqw.ijs.si/event/poster-session-2/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T162900
DTEND;TZID=Europe/Ljubljana:20231212T180000
DTSTAMP:20260407T175621
CREATED:20231207T151454Z
LAST-MODIFIED:20231207T151519Z
UID:3134-1702398540-1702404000@nqw.ijs.si
SUMMARY:Chair: Janez Bonca
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-janez-bonca-2/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T163000
DTEND;TZID=Europe/Ljubljana:20231212T170000
DTSTAMP:20260407T175621
CREATED:20231201T190250Z
LAST-MODIFIED:20231207T151454Z
UID:2586-1702398600-1702400400@nqw.ijs.si
SUMMARY:Andrei Kirilyuk: Shaken\, not stirred: a recipe for ultrafast magnetic switching ‌via phononic resonances
DESCRIPTION:A. Kirilyuk1 \n1FELIX Laboratory\, Radboud University\, Toernooiveld 7\, 6525 ED Nijmegen\, The Netherlands \nStrong light-matter interaction constitutes the bedrock of all photonic applications\, empowering material elements to create and mediate interactions of light with light. Among others\, phononamplified interactions were shown to bring a specific twist into this\, in the infrared (IR) frequency range. Thus\, phono-magnetic effects are the low-frequency analogues of inverse Faraday and Cotton-Mouton effects [1\,2] where phonons\, not electrons\, mediate the interaction between light and spins. In this case\, light couples to the spins indirectly by exciting coherent vibrations of the crystal lattice (phonons) that transfer angular momentum to the magnetic ions [3\,4]. The optically driven chiral phonons in materials with strong spin-orbit coupling were shown to produce giant effective magnetic fields that exceed those previously seen by several orders of magnitude [5]. The mechanism allows for bidirectional control of the induced magnetization through phonon chirality that in turn can be controlled by the polarization of the laser pulse. \nHere we show that through the resonant excitation of circularly-polarized optical phonons in paramagnetic substrates\, one can permanently reverse the magnetic state of the substrate-mounted heterostructure [6]. To provide resonant excitation of the optical phonon modes\, we use pulses from FELIX (Free Electron Lasers for Infrared eXperiments\, Nijmegen\, The Netherlands). Single pulses of IR/THz light with photon energy ranging between 25 meV and 124 meV (wavelength 10-50 μm) are typically used. With the handedness of the phonons steering the direction of magnetic switching\, such effect offers a selective and potentially universal method for exercising ultrafast non-local control over magnetic order. \nMoreover\, a different behaviour\, characterized by displacive modification of magnetic potentials\, can be observed when exciting materials at phonon frequencies with linearly-polarized light. The magnetic switching was shown to create very peculiar quadrupolar domain patterns [7]\, confirming the mechanism. The mechanism appears to be very universal\, and is shown to work in samples with very different crystallographic symmetry and magnetic properties\, including weak ferromagnets [8] and antiferromagnets [9]\, but also completely different systems such as ferroelectrics. Using single-shot time resolved microscopy\, we demonstrate that the dynamics of the domain formation proceeds via a strongly inhomogeneous magnetic state resulting in a self-organization of magnon-polarons [10]. This we could arguably relate to the spin-wave instabilities that appear due to the very large amplitude of precessional magnetic motion in the switching process. \n\nA.V. Kimel\, A. Kirilyuk\, P.A. Usachev\, R.V. Pisarev\, A.M. Balbashov\, and Th. Rasing\, Nature 435\, 655 (2005)\nA. M. Kalashnikova et al\, Phys. Rev. Lett. 99\, 167205 (2007)\nT. F. Nova et al\, Nature Phys. 13\, 132–137 (2017)\nD. M. Juraschek\, M. Fechner\, A. V. Balatsky\, N. A. Spaldin\, Phys. Rev. Mater. 1\, 014401 (2017)\nD.M Juraschek\, T. Neuman\, & P. Narang\, Phys. Rev. Res. 4\, 013129 (2022)\nC.S. Davies\, F.G.N. Fennema\, A. Tsukamoto\, I. Razdolski\, A.V. Kimel\, A. Kirilyuk\, arXiv:2305.11551 (2023)\nA. Stupakiewicz et al\, Nature Phys. 17\, 489 (2021)\nT. Janssen\, M. Gidding\, C. S. Davies\, A. V. Kimel\, and A. Kirilyuk\, Phys. Rev. B 108\, L140405 (2023)\nP. Stremoukhov et al\, New J. Physics 24\, 023009 (2022)\nM. Gidding\, T. Janssen\, C.S. Davies\, and A. Kirilyuk\, Nature Commun. 14\, 2208 (2023)
URL:https://nqw.ijs.si/event/andrei-kirilyuk-shaken-not-stirred-a-recipe-for-ultrafast-magnetic-switching-via-phononic-resonances/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T170000
DTEND;TZID=Europe/Ljubljana:20231212T173000
DTSTAMP:20260407T175621
CREATED:20231201T190305Z
LAST-MODIFIED:20231207T151454Z
UID:2587-1702400400-1702402200@nqw.ijs.si
SUMMARY:Philipp Werner: Photo-induced nonthermal metals
DESCRIPTION:P. Werner\,1 J. Chen\,1 F. Petocchi\,2 M. Eckstein3 \n1Department of Physics\, University of Fribourg\, 1700 Fribourg\, Switzerland \n2Department of Quantum Matter Physics\, University of Geneva\, 1211 Geneva\, Switzerland \n3Institute of Theoretical Physics\, University of Hamburg\, 20355 Hamburg\, Germany \nSeveral insulating materials can be switched by laser pulses into transient metal states with apparently nonthermal properties [1-4]. Often\, this has been interpreted as a nonthermal closing of a Mott gap. An alternative mechanism is the generation of in-gap states by the nonthermal population of multiplets (e. g. singlet-triplet excitations in dimerized systems)\, or the nonthermal reshuffling of charge between orbitals. I will present recent nonequilibrium dynamical mean field theory studies of model systems\, which provide insights into the nature of photo-induced nonthermal metal states in 1T-TaS2 [5] and rare earth nickelates [6]\, and realistic simulations of the photo-induced dynamics in VO2 [7]\, which clarify the excitation and charge reshuffling processes leading to the nonthermal monoclinic metal phase.  \n\nM. Ligges et al. Phys. Rev. Lett. 120\, 166401 (2018)\nJ. Dong et al.\, arxiv:2210.11052 (2022)\nV. R. Morrison et al.\, Science 346\, 445 (2014)\nD. Wegkamp et al.\, Phys. Rev. Lett. 113\, 216401 (2014) \nF. Petocchi et al.\, Phys. Rev. B 107\, 165102 (2023)\nP. Werner et al.\, Phys. Rev. B 107\, 035157 (2023)\nJ. Chen\, et al.\, arxiv:2310.18195 (2023)
URL:https://nqw.ijs.si/event/philipp-werner-photo-induced-nonthermal-metals/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T173000
DTEND;TZID=Europe/Ljubljana:20231212T174500
DTSTAMP:20260407T175621
CREATED:20231201T190305Z
LAST-MODIFIED:20231207T151455Z
UID:2588-1702402200-1702403100@nqw.ijs.si
SUMMARY:Kazuki Yamamoto: Entanglement phase transition under continuously monitored dynamics ‌in many-body localized systems
DESCRIPTION:K. Yamamoto1\, R. Hamazaki2 \n1Department of Physics\, Tokyo Institute of Technology\, Meguro\, Tokyo 152-8551\, Japan  \n2Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team\, RIKEN Cluster for Pioneering Research\, RIKEN iTHEMS\, Wako\, Saitama 351-0198\, Japan \nLocalization\, which is typically induced by disorder\, is an exotic phenomenon where a quantum state fails to spread over the entire Hilbert space. Recently\, measurement is utilized as another mechanism to localize a quantum state in nonunitary quantum circuits and continuously monitored systems\, which exhibit novel quantum phenomena dubbed measurement-induced phase transitions (MIPTs). However\, while both the disorder and the measurement localize the wave function and suppress the entanglement spreading\, it is still not clear whether they exhibit the same localization properties. \nIn this talk\, we study the localization properties of continuously monitored dynamics and associated MIPTs in disordered quantum many-body systems on the basis of the quantum trajectory approach [1]. By calculating the fidelity between random quantum trajectories\, we demonstrate that the disorder and the measurement can lead to dynamical properties distinct from each other\, although both have a power to suppress the entanglement spreading. In particular\, in the large-disorder regime with weak measurement\, we elucidate that the fidelity exhibits an anomalous power-law decay before saturating to the steady-state value. Furthermore\, we propose a general method to access physical quantities for quantum trajectories in continuously monitored dynamics without resorting to postselection. It is argued that this scheme drastically reduces the cost of experiments. Our results can be tested in ultracold atoms subject to continuous measurement. \n\nK. Yamamoto and R. Hamazaki\, Phys. Rev. B 107\, L220201 (2023)
URL:https://nqw.ijs.si/event/kazuki-yamamoto-entanglement-phase-transition-under-continuously-monitored-dynamics-in-many-body-localized-systems/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T174500
DTEND;TZID=Europe/Ljubljana:20231212T180000
DTSTAMP:20260407T175621
CREATED:20231201T190305Z
LAST-MODIFIED:20231207T151455Z
UID:2589-1702403100-1702404000@nqw.ijs.si
SUMMARY:Giuliano Chiriaco: Entanglement transition and monogamy effects in non-Markovian systems
DESCRIPTION:G. Chiriacò\,1 M. Tsitsishvili\,2\,3 D. Poletti\,4\,5 M. Dalmonte2\,3 \n1Dipartimento di Fisica e Astronomia\, Università di Catania\, Italy \n2Scuola Internazionale di Studi Superiori Avanzati (SISSA)\, Trieste\, Italy \n3The Abdus Salam International Centre for Theoretical Physics (ICTP)\, Trieste\, Italy \n4Science\, Mathematics and Technology Cluster\, Singapore University of Technology and Design\, Singapore \n5Engineering Product Development Pillar\, Singapore University of Technology and Design\, \nSingapore \nIn the last few years there has been great interest in the dynamics of monitored quantum many-body systems. The interplay between unitary evolution and dissipative dynamics leads to many effects\, including measurement induced phase transitions of the entanglement scaling. While earlier works all considered Markovian dissipative processes\, lately there has been growing interest in non-Markovian dissipation and the effect of memory on entanglement transitions [1]. \nI will present recent results and developments on the study of entanglement in non-Markovian systems [2]. In particular\, I will focus on a free fermions ladder model\, where one of the chains is the system of interest and the other chain (bath chain) is subjected to Markovian projective measurements. The global dynamics is Markovian and can be studied through standard Montecarlo quantum jumps methods\, but because of the internal dynamics of the bath chains\, the reduced dynamics on the system chain is non-Markovian. The introduction of this ancillary chain allows to study the entanglement transition in the presence of memory effects. The studied model exhibits a variety of phases\, including transition a from area-law to CFT phase and different regimes where the monogamy of entanglement produces strong counter-intuitive effects. \n\nG. Chiriacò et al.\, Phys. Rev. B 108\, 075151 (2023)\nM Tsitsishvili et al.\, arXiv:2307.06624
URL:https://nqw.ijs.si/event/giuliano-chiriaco-entanglement-transition-and-monogamy-effects-in-non-markovian-systems/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T180000
DTEND;TZID=Europe/Ljubljana:20231212T193000
DTSTAMP:20260407T175621
CREATED:20231201T195237Z
LAST-MODIFIED:20231207T151504Z
UID:2753-1702404000-1702409400@nqw.ijs.si
SUMMARY:Dinner
DESCRIPTION:
URL:https://nqw.ijs.si/event/dinner-7/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T192900
DTEND;TZID=Europe/Ljubljana:20231212T203000
DTSTAMP:20260407T175621
CREATED:20231207T151504Z
LAST-MODIFIED:20231207T151536Z
UID:3135-1702409340-1702413000@nqw.ijs.si
SUMMARY:Chair: Yuta Murakami
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-yuta-murakami/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T193000
DTEND;TZID=Europe/Ljubljana:20231212T200000
DTSTAMP:20260407T175621
CREATED:20231201T190305Z
LAST-MODIFIED:20231207T151504Z
UID:2591-1702409400-1702411200@nqw.ijs.si
SUMMARY:Jaka Vodeb: Probing Dynamical Resonances In A 5564 Qubit Quantum Annealer
DESCRIPTION:J. Vodeb\,1\,2 F. Jin\,1 D. Willsch\,1 M. Willsch\,1\,4 A. Rava\,1\,5J.-Y. Desaules\,3 Z. Papic\,3 K. Michielsen1\,4\,5 \n1Jülich Supercomputing Centre\, Institute for Advanced Simulation\, Forschungszentrum Jülich\, 52425 Jülich\, Germany \n2Jozef Stefan Institute\, Dept. of Complex Matter\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \n3School of Physics and Astronomy\, University of Leeds\, Leeds LS2 9JT\, UK \n4AIDAS\, 52425 Jülich\, Germany \n5RWTH Aachen University\, 52056 Aachen\, Germany \nUnderstanding the dynamics of complex\, strongly interacting many-body systems is crucial in the field of quantum science and engineering. Recent advancements in controlling programmable many-body systems have provided insights into nonequilibrium states\, often inaccessible to classical simulations [1-3]. This talk explores the concept of dynamical resonances\, which are radically distinct magnetization dynamics occurring only within a very narrow parameter regime\, in the transverse field Ising model realized on a quantum annealer. One example that emerges in such a resonant regime are quantum many-body scars\, which are rare\, non-thermalizing eigenstates that challenge our understanding of quantum thermalization and ergodicity [4-6]. \nWe will delve into the theoretical and experimental aspects of dynamical resonances\, discussing their relevance in the context of quantum annealing [7\,8]. In particular\, we focus on their emergence in the ferromagnetic transverse field Ising model\, examining how these elusive quantum phenomena might manifest in state-of-the-art quantum annealers equipped with up to 5564 qubits. The aim of this investigation is to shed light on the properties and dynamics of dynamical resonances\, potentially leading to the largest non-equilibrium quantum simulation to date. \nThis talk will encompass theoretical predictions\, experimental setup\, methodologies\, and preliminary results. We will also touch upon the broader implications of understanding dynamical resonances\, as they hold the potential to steer entanglement dynamics in complex many-body systems\, opening new avenues in quantum science and engineering. \n\nA.M. Kaufman et al. Science\, 353\, 794-800 (2016)\nM. Schreiber et al. Science 349\, 842–845 (2015)\nT. Langen et al. Science 348\, 207–211 (2015)\nE. J. Heller Phys. Rev. Lett. 53\, 1515–1518 (1984)\nH. Bernien et al. Nature 551\, 579–584 (2017)\nC. J. Turner et al. Nat. Phys. 14\, 745–749 (2018)\nA.D. King et al. Nature 617\, 61–66 (2023)\nA.D. King et al. Nat. Phys. 18\, 1324–1328 (2022)
URL:https://nqw.ijs.si/event/jaka-vodeb-probing-dynamical-resonances-in-a-5564-qubit-quantum-annealer/
CATEGORIES:NQW 2023
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T200000
DTEND;TZID=Europe/Ljubljana:20231212T201500
DTSTAMP:20260407T175621
CREATED:20231201T190320Z
LAST-MODIFIED:20231207T151504Z
UID:2592-1702411200-1702412100@nqw.ijs.si
SUMMARY:Jernej Mravlje: Ta2NiSe5: excitonic or not?
DESCRIPTION:B. Chatterjee1\, J. Mravlje\,2\,3 D. Golež2\,3 \n1Faculty of Physics\, University of Duisburg-Essen\, 47057 Duisburg\, Germany \n2Jozef Stefan Institute\, SI-1000 Ljubljana\, Slovenia \n3FMF\, University of Ljubljana\, SI-1000 Ljubljana\, Slovenia \nTa2NiSe5 has long been considered as a prominent candidate for realization of the excitonic condensation that was invoked to explain the opening of the gap in the photoemission and to rationalize the existence of short time scales in pump-probe experiments. A structural transition that coincides with the putative excitonic transition leads to eternal chicken-egg debate addressing the dominant mechanism of the transition.  We consider a realistic 6 orbital model and discuss its instabilities in Hartree-Fock calculations including the relevant B2g Raman active phonon. The model realizes excitonic transition with experimentally expected symmetry only provided the electron-phonon coupling is taken into account. From time-dependent calculations we evaluate also two-particle response corresponding to Raman and optical spectra. The key feature of the calculated response is a prominent phase mode\, and the extent to which it survives in the structurally distorted ground state may help settling the debate.
URL:https://nqw.ijs.si/event/jernej-mravlje-ta2nise5-excitonic-or-not/
CATEGORIES:NQW 2023
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BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T201500
DTEND;TZID=Europe/Ljubljana:20231212T203000
DTSTAMP:20260407T175621
CREATED:20231201T190320Z
LAST-MODIFIED:20231207T151504Z
UID:2593-1702412100-1702413000@nqw.ijs.si
SUMMARY:Alexander Osterkorn: Current-induced excitonic condensation in bilayer systems
DESCRIPTION:A. Osterkorn\,1 D. Golež1\,2 \n1Jožef Stefan Institute\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \n2Faculty of Mathematics and Physics\, University of Ljubljana\, Jadranska 19\, 1000 Ljubljana\, Slovenia \nExcitons are correlated electron-hole pairs in multi-band electron systems\, which can condense and form ordered phases of matter called excitonic insulators. These are expected to display novel and technologically highly relevant features like superfluid energy transport. While it is experimentally challenging to identify real materials hosting equilibrium excitonic order\, out-of-equilibrium protocols open up an independent route to stabilize excitonic condensates. \nMa et.al. [1] proposed a gated semiconductor bilayer architecture\, in which an applied voltage bias allows for the continuous creation of interlayer excitons by means of an induced electrical current. We model the setup starting from the quasi-stationary situation [2] within the static Hartree-Fock and second order Born approximations. We compare results from dynamical mean-field theory to simulations in one spatial dimension to shed light on the strong impact of dimensionality on the formation of the excitonic state. To go beyond the quasi-stationary case\, we discuss results of time-dependent simulations of a driven four-band model in one spatial dimension\, which is coupled to a bosonic bath. \n\nMa\, L. et al. Nature 598\, 585–589 (2021)\nMing Xie and A.H. MacDonald\, PRL 121\, 067702 (2018)
URL:https://nqw.ijs.si/event/alexander-osterkorn-current-induced-excitonic-condensation-in-bilayer-systems/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231212T203000
DTEND;TZID=Europe/Ljubljana:20231212T223000
DTSTAMP:20260407T175621
CREATED:20231202T205047Z
LAST-MODIFIED:20231207T151509Z
UID:3041-1702413000-1702420200@nqw.ijs.si
SUMMARY:Social Event
DESCRIPTION:
URL:https://nqw.ijs.si/event/social-event-5/
CATEGORIES:NQW 2023
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