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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:20231211T085900
DTEND;TZID=Europe/Ljubljana:20231211T101500
DTSTAMP:20260428T010956
CREATED:20231207T151236Z
LAST-MODIFIED:20231207T151322Z
UID:3111-1702285140-1702289700@nqw.ijs.si
SUMMARY:Chair: Simon Gerber
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-simon-gerber/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T090000
DTEND;TZID=Europe/Ljubljana:20231211T094500
DTSTAMP:20260428T010956
CREATED:20231201T190135Z
LAST-MODIFIED:20231207T151300Z
UID:2560-1702285200-1702287900@nqw.ijs.si
SUMMARY:Dragan Mihailovic: Tutorial. Trajectories through emergent metastable states ‌in 2D correlated electron systems
DESCRIPTION:D. Mihailovic1\,2\,3 \n1Department of Complex Matter\, Jozef Stefan Institute\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \n2Faculty of Mathematics and Physics\, University of Ljubljana\, SI-1000 Ljubljana\, Slovenia \n3CENN Nanocenter\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \nNon-equilibrium states of matter have become of great fundamental and practical interest in recent years because of their wide importance in diverse areas of physics. With the rapid development of new time-resolved techniques\, the temporal dynamics of competing processes and interactions were recently elucidated in a wide variety of complex condensed matter systems. However\, the physics of metastable mesoscopically non-periodic quantum textures emerging from phase transitions has been largely experimentally inaccessible till now: current state of the art time-resolved methods using x-rays\, electron diffraction\, photoemission\, THz and optical spectroscopy all average over multiple transition outcomes. Moreover\, they cannot resolve irregular nonperiodic nanoscale structures\, but some progress has been made in the use of scanning tunneling microscopy. Here I will outline experimental and theoretical progress in the study of emergent phenomena in metastable states\, concentrating on well-known systems that offer insights into complex physics of multicomponent non-equilibrium electronic systems\, such as charge fractionalization\, jamming and topologically arrested kinetics.
URL:https://nqw.ijs.si/event/dragan-mihailovic-tutorial-trajectories-through-emergent-metastable-states-in-2d-correlated-electron-systems/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T094500
DTEND;TZID=Europe/Ljubljana:20231211T101500
DTSTAMP:20260428T010956
CREATED:20231201T190135Z
LAST-MODIFIED:20231207T151300Z
UID:2561-1702287900-1702289700@nqw.ijs.si
SUMMARY:Yuta Murakami: Possible hidden phases in photo-doped Mott insulators
DESCRIPTION:Y. Murakami1 \n1Center for Emergent Matter Science\, RIKEN\, Wako\, Saitama 351-0198\, Japan \nDoping charge carriers into Mott insulators provides a pathway to produce intriguing emergent phenomena. In equilibrium systems\, doping can be chemically controlled. On the other hand\, photo-doping\, where particles are excited across the Mott gap\, provides an alternative way. Compared to chemical-doping\, photo-doping creates a wider variety of charge carriers\, which may lead to the emergence of fascinating nonequilibrium states. In particular\, when the gap is large\, the lifetime of photo-carriers is exponentially enhanced\, leading to quasi-steady states after intraband cooling of photo-carriers. \nIn this talk\, we explore possible hidden phases that arise as quasi-steady states of photodoped Mott insulators using the quasi-equilibrium approach [1]. Within this approach\, we treat the photo-doped state as an equilibrium state of an effective model for a given photo-doping level. We apply the idea to the 1D extended Hubbard model. In the first part [1]\, we present our numerical results obtained with the infinite time-evolving block decimation. We show the emergence of the so-called η-pairing phase and the string charge-density-wave phase\, and discuss their physical properties. In the second part [2]\, we reveal the analytical aspects of these photo-doped states. We show that the corresponding wave function in the large on-site interaction limit can be expressed as \, which indicates the separation of spin\, charge and η−spin degrees of freedoms. Here η−spin represents the type of the photo-carriers\, i.e. doublons and holons. This state is analogous to the celebrated Ogata-Shiba state of the doped Hubbard model in equilibrium. The expression provides us useful insight into the properties of the photo-doped states. Our results demonstrate that the emergent degrees of freedom activated by photo-doping can lead to peculiar types of quantum states absent in equilibrium. \n\nY. Murakami\, S. Takayoshi\, T. Kaneko\, Z. Sun\, D. Golež\, A. J. Millis\, P. Werner\, Comm. Phys. 5\, 23 (2022)\nY. Murakami\, S. Takayoshi\, T. Kaneko\, A. Läuchli\, P. Werner\, Phys. Rev. Lett. 130\, 106501 (2023)
URL:https://nqw.ijs.si/event/yuta-murakami-possible-hidden-phases-in-photo-doped-mott-insulators/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T101500
DTEND;TZID=Europe/Ljubljana:20231211T104500
DTSTAMP:20260428T010956
CREATED:20231201T195107Z
LAST-MODIFIED:20231207T151300Z
UID:2748-1702289700-1702291500@nqw.ijs.si
SUMMARY:Coffee Break
DESCRIPTION:
URL:https://nqw.ijs.si/event/coffee-break-4/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T104400
DTEND;TZID=Europe/Ljubljana:20231211T120000
DTSTAMP:20260428T010956
CREATED:20231207T151300Z
LAST-MODIFIED:20231207T151338Z
UID:3115-1702291440-1702296000@nqw.ijs.si
SUMMARY:Chair: Patrycja Łydżba
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-patrycja-lydzba-2/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T104500
DTEND;TZID=Europe/Ljubljana:20231211T111500
DTSTAMP:20260428T010956
CREATED:20231201T190150Z
LAST-MODIFIED:20231207T152049Z
UID:2563-1702291500-1702293300@nqw.ijs.si
SUMMARY:Zala Lenarčič: Tutorial. Flavours of Openness
DESCRIPTION:Z. Lenarčič1 \n1Jožef Stefan Institute\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \nI will introduce and review different aspects of open quantum systems dynamics\, providing some background and motivation for the 2023 NQW talks with a flavour of openness.
URL:https://nqw.ijs.si/event/zala-lenarcic-tutorial-tbd/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T111500
DTEND;TZID=Europe/Ljubljana:20231211T114500
DTSTAMP:20260428T010956
CREATED:20231207T151315Z
LAST-MODIFIED:20231207T151315Z
UID:3118-1702293300-1702295100@nqw.ijs.si
SUMMARY:Gergely Zarand: Non-equilibrium transport and quantum information jet ‌in the Hubbard model
DESCRIPTION:M.A. Werner\,1\,2\,3 C.P. Moca\,2\,4 P. Penc\,1\,2 M. Kormos\,1\,2A. Valli\,1\,2 Ö. Legeza\,3 T. Prosen\,5 G. Zarand1\,2 \n1Department of Theoretical Physics\, Institute of Physics\, Budapest University of Technology and Economics\, Budafoki u ́t 8.\, H-1111 Budapest\, Hungary  \n2HUN-REN–BME Quantum Dynamics and Correlations Research Group\, Budapest University of Technology and Economics\, Műegyetem rkp. 3.\, H-1111 Budapest\, Hungary  \n3Strongly Correlated Systems Lendulet Research Group\, Wigner Research Centre for Physics\, H-1525\, Budapest\, Hungary  \n4Department of Physics\, University of Oradea\, 410087\, Oradea\, Romania  \n5Department of Physics\, Faculty of Mathematics and Physics\, University of Ljubljana\, Jadranska 19\, SI-1000 Ljubljana\, Slovenia \nIn this presentation\, I focus on the impact of interaction and symmetries on non-equilibrium charge and spin transport in the Hubbard model. The structure of non-equilibrium dynamics is found to change dramatically upon increasing interaction [1-4]. In usual quench experiments\, a relatively standard Fermi liquid-like behavior appears for small interactions\, while phenomena such as composite particle formation along with negative temperature states emerge for larger interactions [1]. \nThe properties of the infinite temperature state depend crucially on symmetries. At half-filling\, he SU(2) Hubbard model exhibits global SUc(2)⊗SUs(2) symmetry\, and there  Kardar-Parisi-Zhang (KPZ) scaling is observed in charge and spin correlations and transport [2]. Away from half-filling\, however\, the SUc(2) charge symmetry is reduced to Uc(1)\, while the SUs(2) symmetry for the total spin is retained. Consequently\, transport in the charge sector becomes ballistic\, while KPZ scaling is preserved in the spin sector. The anomalous diffusion coefficient is found to scale as 1/U at large U. \nIn the presence of localized particle loss at the end of a semi-infinte chain\, we observe a ballistic current front propagation with strongly renormalized front velocity\, and a hydrodynamic current density profile. Operator entanglement is found to propagate faster than the depletion profile\, preceding the latter [3]\, and a mutual information jet appears that propagates with a velocity independent of U. While the slow front can be captured by a cellular automaton model and carries classical correlations\, the fast mutual information front appears to have a quantum-mechanical nature\, and persists at infinite temperature and interaction. \n\nM.A. Werner\, C.P. Moca\, M. Kormos\, Ö. Legeza\, B. Dóra\, G. Zaránd\, Spectroscopic evidence for engineered hadron formation in repulsive fermionic SU(N) Hubbard Models\, Phys. Rev. Research 5\, 043020 (2023)\nC.P. Moca\, M.A. Werner\, A. Valli\, T. Prosen\, G. Zaránd\, Kardar-Parisi-Zhang scaling in the Hubbard model\, Phys. Rev. B\, in print [arXiv:2306.11540]\nC.P. Moca\, M.A. Werner\, Ö. Legeza\, T. Prosen\, M. Kormos\, G. Zaránd\, Simulating Lindbladian evolution with non-abelian symmetries: Ballistic front propagation in the SU(2) Hubbard model with a localized loss\, Phys. Rev. B 105\, 195144 (2022)\nP. Penc\, C.P. Moca\, T. Prosen\, G. Zaránd\, M.A. Werner\, Quantum-information jet in the infinite temperature Hubbard model\, unpublished
URL:https://nqw.ijs.si/event/gergely-zarand-non-equilibrium-transport-and-quantum-information-jet-in-the-hubbard-model/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T114500
DTEND;TZID=Europe/Ljubljana:20231211T120000
DTSTAMP:20260428T010956
CREATED:20231201T190150Z
LAST-MODIFIED:20231207T151927Z
UID:2565-1702295100-1702296000@nqw.ijs.si
SUMMARY:Poster flash talks
DESCRIPTION:Yelyzaveta Chernolevska: Superconductivity in the epitaxially grown 1T-TaS2: The effect of strain and substrate ion diffusion\nMichele Coppola: Conditional no-jump dynamics of non-interacting quantum chains\nGregor Jecl: Table-top EUV polarimeter for probing ultrafast magnetization dynamics\nSimon Jiricek: Critical quantum dynamics of observables at eigenstate transitions\nMariel Kempa: Nontrivial damping of quantum many-body dynamics in the spin-1/2 XXZ chain\nKlemen Kovač: Optical manipulation of bipolarons in a system with nonlinear electron-phonon coupling\nKlemen Kovač: Important role of phononic dispersion in bipolaronic systems\nMarkus Kraft: Constructing nonequilibrium steady states from equilibrium correlation functions in generic nonintegrable systems\nGianluca Lagnese: Probing stability of false vacuum with quantum quenches\nLuka Medic: High-harmonic generation in semi-Dirac and Weyl semimetals with broken time-reversal symmetry: Exploring merging of Weyl nodes\nFrancesco Sammartino: Impact of coherent phononons on the linear and non-linear time-resolved optical properties of Tellurium\nJan Šuntajs: Similarity between a many-body quantum avalanche model and the ultrametric random matrix model\nSoma Takemori: Theory of Non-Hermitian Fermionic Superfluidity on a Honeycomb Lattice: Interplay between Exceptional Manifolds and Van Hove Singularity\nMartin Ulaga: Finite-temperature properties of the easy-axis Heisenberg model on frustrated lattices
URL:https://nqw.ijs.si/event/poster-flash-talks/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T120000
DTEND;TZID=Europe/Ljubljana:20231211T131500
DTSTAMP:20260428T010956
CREATED:20231201T195122Z
LAST-MODIFIED:20231207T151316Z
UID:2749-1702296000-1702300500@nqw.ijs.si
SUMMARY:Lunch
DESCRIPTION:
URL:https://nqw.ijs.si/event/lunch-5/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T131500
DTEND;TZID=Europe/Ljubljana:20231211T163000
DTSTAMP:20260428T010956
CREATED:20231201T190150Z
LAST-MODIFIED:20231207T151316Z
UID:2566-1702300500-1702312200@nqw.ijs.si
SUMMARY:Free time / Poster Session
DESCRIPTION:
URL:https://nqw.ijs.si/event/poster-session/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T162900
DTEND;TZID=Europe/Ljubljana:20231211T180000
DTSTAMP:20260428T010956
CREATED:20231207T151316Z
LAST-MODIFIED:20231207T151404Z
UID:3119-1702312140-1702317600@nqw.ijs.si
SUMMARY:Chair: Miroslav Hopjan
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-miroslav-hopjan-2/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T170000
DTEND;TZID=Europe/Ljubljana:20231211T173000
DTSTAMP:20260428T010956
CREATED:20231201T190205Z
LAST-MODIFIED:20231207T151352Z
UID:2569-1702314000-1702315800@nqw.ijs.si
SUMMARY:Tomaz Prosen: Critical Full Counting Statistics in Integrable Spin Chains
DESCRIPTION:T. Prosen1 \n1Faculty of mathematics and physics\, University of Ljubljana\, Jadranska 19\, SI-1000 Ljubljana\, Slovenia
URL:https://nqw.ijs.si/event/tomaz-prosen-critical-full-counting-statistics-in-integrable-spin-chains/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T173000
DTEND;TZID=Europe/Ljubljana:20231211T180000
DTSTAMP:20260428T010956
CREATED:20231201T190205Z
LAST-MODIFIED:20231207T151352Z
UID:2570-1702315800-1702317600@nqw.ijs.si
SUMMARY:Denis Arčon: The pairing symmetry in the quasi-one-dimensional superconductors A2Mo3As3 (A=Rb\, Cs)
DESCRIPTION:D. Arčon\,1\,2 Ž. Gosar\,1 B. Lv3 \n1Institute Jožef Stefan\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \n2Faculty of mathematics and physics\, University of Ljubljana\, Jadranska 19\, SI-1000 Ljubljana\, Slovenia \n3University of Texas at Dallas\, Dallas\, TX\, U.S.A. \nThe A2Mo3As3 (A = K\, Rb\, Cs) compounds are built of assembled Mo3As3 chains and are thus the potential realisations of quasi-one-dimensional metals. Various experiments on these materials hint to the Tomonaga-Luttinger liquid (TLL) physics from which superconductivity with a relatively high critical temperatures of Tc ≈ 10.5 K emerges. However\, TLL and its relevance to emerging superconductivity are not yet resolved for A2Mo3As3 due to their multiband nature. \nHere we report a combined 75As nuclear quadrupole resonance (NQR)\, 87Rb and 133Cs nuclear magnetic resonance (NMR) and muon spin relaxation (μSR) study of Rb2Mo3As3 and Cs2Mo3As3 powders. The alkali metal spin-lattice relaxation rates show a characteristic power-law temperature dependence over a broad temperature range\, which is a hallmark of the TLL dynamics dominated by the two-quasi-one-dimensional bands. Detailed analysis reveals that these compounds may be in an unusual state of effective attractive interactions\, which opens up intriguing possibilities for the unconventional pairing symmetries of the superconducting state. To address the superconducting state we\, in addition to 75As and alkali metal relaxation rate studies\, employ also the \,transverse-field μSR. The temperature dependence of the muon relaxation rate\, σ\, is in the superconducting state due to the field distribution created by the vortex lattice and is compared against s-\, p- \, and d-wave scenarios. The penetration depth λ = 669 nm and the coherence length ζ = 3.4 nm are also determined. \n\nŽ. Gosar et al.\, Phys. Rev. B 101\, 220508(R) (2020)\nŽ. Gosar et al.\, J. Phys. Chem. Solids 181\, 111478 (2023)
URL:https://nqw.ijs.si/event/denis-arcon-the-pairing-symmetry-in-the-quasi-one-dimensional-superconductors-a2mo3as3-arb-cs/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T180000
DTEND;TZID=Europe/Ljubljana:20231211T193000
DTSTAMP:20260428T010956
CREATED:20231201T195137Z
LAST-MODIFIED:20231207T151352Z
UID:2750-1702317600-1702323000@nqw.ijs.si
SUMMARY:Dinner
DESCRIPTION:
URL:https://nqw.ijs.si/event/dinner-6/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T192900
DTEND;TZID=Europe/Ljubljana:20231211T203000
DTSTAMP:20260428T010956
CREATED:20231207T151352Z
LAST-MODIFIED:20231207T151423Z
UID:3123-1702322940-1702326600@nqw.ijs.si
SUMMARY:Chair: Gregor Jotzu
DESCRIPTION:
URL:https://nqw.ijs.si/event/chair-gregor-jotzu/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T193000
DTEND;TZID=Europe/Ljubljana:20231211T200000
DTSTAMP:20260428T010956
CREATED:20231201T190220Z
LAST-MODIFIED:20231207T151407Z
UID:2572-1702323000-1702324800@nqw.ijs.si
SUMMARY:Jure Demsar: TBD
DESCRIPTION:J. Demsar1 \n1Institute of Physics\, Johannes Gutenberg-Universität Mainz\, Staudingerweg 7\, 55128 Mainz\, Germany
URL:https://nqw.ijs.si/event/jure-demsar-tbd/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T200000
DTEND;TZID=Europe/Ljubljana:20231211T201500
DTSTAMP:20260428T010956
CREATED:20231201T190220Z
LAST-MODIFIED:20231207T151408Z
UID:2573-1702324800-1702325700@nqw.ijs.si
SUMMARY:Nelson Hua: Ultrafast Electronic Domain Fluctuations Detected in a Nonequilibrium X-Ray Speckle Visibility Experiment
DESCRIPTION:N. Hua\,1  Y. Sun\,2 P. Rao\,3 N. Z. Hagström\,3 B. Stoychev\,4 E. Lamb\,4 Meera\,3S. T. Botu\,3 S. Jeppson\,3 S.-W. Huang\,5 V. Esposito\,2 D. Zhu\,2 T. Sato\,2 S. Song\,2E. E. Fullerton\,6 O. G. Shpyrko\,4 R. Kukreja\,3 S. Gerber1 \n1Laboratory for X-Ray Nanoscience and Technologies\, Paul Scherrer Institut\, CH-5232 Villigen PSI\, Switzerland \n2Linac Coherent Light Source\, SLAC National Accelerator Laboratory\, Menlo Park\, California 94025\, USA \n3Department of Materials Science Engineering\, University of California-Davis\, Davis\, California 95616\, USA \n4Department of Physics\, University of California\, San Diego\, La Jolla\, California 92093\, USA \n5Swiss Light Source\, Paul Scherrer Institut\, CH-5232 Villigen PSI\, Switzerland \n6Center for Memory and Recording Research\, University of California\, San Diego\, La Jolla\, California\, 92093\, USA \nSince the advent of X-ray free electron lasers\, a standard method to study metal-insulator transitions is in a nonequilibrium pump-probe diffraction experiment to disentangle how different order parameters evolve at ultrafast timescales. However\, this technique is blind to domain fluctuations of the order parameter that may play a critical role in driving these nonequilibrium transitions. To directly couple to these domain fluctuations at ultrafast timescales requires coherent X-ray probes following a laser excitation. Here we employed a novel coherent X-ray technique that uses a split-and-delay line in a pump-probe-probe experimental scheme to measure ultrafast domain fluctuations for the first time. This experiment was carried out at the X-ray Correlation Spectroscopy (XCS) beamline of the Linac Coherent Light Source (LCLS) where we accessed the speckle pattern of a resonant charge order peak in Fe3O4 to quantify domain fluctuations with 1-picosecond temporal resolution. A complementary\, standard X-ray pump-probe experiment on the same charge order peak was carried out at the Bernina end station of SwissFEL to reveal ultrafast melting of the electronic order parameter. Together these two experiments reveal the nonequilibrium evolution of the charge order at picosecond and nanometer length scales.
URL:https://nqw.ijs.si/event/nelson-hua-ultrafast-electronic-domain-fluctuations-detected-in-a-nonequilibrium-x-ray-speckle-visibility-experiment/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T201500
DTEND;TZID=Europe/Ljubljana:20231211T203000
DTSTAMP:20260428T010956
CREATED:20231201T190220Z
LAST-MODIFIED:20231207T151408Z
UID:2574-1702325700-1702326600@nqw.ijs.si
SUMMARY:Gregor Humar: False vacuum decay in the transverse field Ising model ‌on a quantum annealer
DESCRIPTION:G. Humar\,1\,2 J. Vodeb\,1\,2\,3 D. Mihailovic1\,2\,4 \n1Department of Complex Matter\, Jozef Stefan Institute\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \n2Department of Physics\, Faculty for  Mathematics and Physics\, Jadranska 19\, University of Ljubljana\, SI-1000 Ljubljana\, Slovenia \n3Institute for Advanced Simulation\, Jülich Supercomputing Centre\, Forschungszentrum Jülich\, Wilhelm-7 Johnen-Straße\, DE-52425 Jülich\, Germany \n4CENN Nanocenter\, Jamova 39\, SI-1000 Ljubljana\, Slovenia \nThis presentation deals with using quantum annealing for observing false vacuum decay in the transverse field Ising model. False vacuum decay is one of the central ideas in quantum field theory. It describes a scenario where a system in a metastable false vacuum state transitions to the true vacuum state. The transition happens by creation of bubbles of true vacuum that expand over the whole system. The timescales and the dynamics of this phenomenon are difficult to observe and describe analytically. The process of transition is analogue to first order phase transitions in condensed matter physics. Metastable states with analogous dynamics can be observed on measurable timescales. An example of such a system is the transverse field Ising model\, where false vacuum decay appears in nonequilibrium dynamics following a sudden change in the direction of the external field. Numerical studies have shown the existance of a set of parameters for which false vacuum decay can be observed. Transverse field Ising model is implemented in the D-Wave quantum annealer. Measurements on this device are used to simulate the dynamics of the transverse Ising model. In general\, results of simulations show decay dynamics that do not match the theoretical description of the false vacuum decay exactly. This implies additions effects on the dynamics. In the specific limit of low transverse fields and high longitudinal fields the measured dynamics approach the theoretically expected dynamics. Possible explanations for the observed deviations include the open nature of the system in the quantum annealer\, the slow change of the field direction and poor validity of the approximations used for theoretical predictions for magnitudes of fields used in the simulations. \n\nS. Coleman\, Phys. Rev. D 15\, 2929 (1977)\nM. S. Turner et al. Nature 298\, 633 (1982)\nP. Calabrese et al. Journal of Statistical Mechanics: Theory and Experiment 2012\, P07016 (2012)\nM. Kormos et al. Nature Physics 13\, 246 (2016)\nS. B. Rutkevich\, Phys. Rev. B 60\, 14525 (1999)\nG. Lagnese et al. Phys. Rev. B 104\, L201106 (2021) \nO. Pomponio et al. SciPost Phys. 12\, 061 (2022)
URL:https://nqw.ijs.si/event/gregor-humar-false-vacuum-decay-in-the-transverse-field-ising-model-on-a-quantum-annealer/
CATEGORIES:NQW 2023
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Ljubljana:20231211T203000
DTEND;TZID=Europe/Ljubljana:20231211T223000
DTSTAMP:20260428T010956
CREATED:20231202T204945Z
LAST-MODIFIED:20231207T151408Z
UID:3040-1702326600-1702333800@nqw.ijs.si
SUMMARY:Social Event
DESCRIPTION:
URL:https://nqw.ijs.si/event/social-event-4/
CATEGORIES:NQW 2023
END:VEVENT
END:VCALENDAR