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Chair: Denis Golez

  • Invited talk

Fabian Heidrich-Meisner: Nonequilibrium dynamics and transport in Holstein models

Understanding the properties of real materials requires the incorporation of multiple degrees of freedom into the theoretical modeling. In this research, we focus on the coupling of electrons to phonons. We developed a comprehensive matrix-product-states based schemes that allows to compute spectral functions, optical conductivity and thermal conductivity of one-dimensional Holstein chains, both for the polaron case and half filling, and at finite temperatures. These techniques work well in t...

  • Invited talk

Jacek Herbrych: Breakdown of Hilbert space fragmentation

Description of the relaxation or thermalization of the strongly correlated system close to the integrable point remains a challenge. Although the fate of such systems is ultimately an ergodic dynamic, the road to it could take an extremely long time and can display some exotic (type of integrability breaking-dependent) behavior. On the one hand, many extremely long-time scales - reminiscent of integrals of motions - prevent numerical simulations from reaching an unbiased conclusion on such sy...

  • Contributed talk

Žiga Krajnik: Dynamical universality of charged single-file systems and integrable spin chains

We introduce and discuss dynamical universality of charge fluctuations in charged single-file systems. The full counting statistics of such systems out of equilibrium generically undergoes first and second order dynamical phase transitions, while equilibrium typical fluctuations are non-Gaussian and given by a universal distribution. Similar phenomenology of dynamical criticality is observed in equilibrium in the easy axis and isotropic regimes of an integrable spin chain. While the easy axis...

Coffee Break

Chair: Daniele Fausti

  • Invited talk

Theo Rasing: Optical control of magnetism thru strongly non-equilibrium phases

The ability to switch magnets between two stable bit states is the main principle of digital data storage technologies since the early days of the computer. Since our demonstration of magnetization reversal by a single 40 femtosecond laser pulse, the manipulation of spins by ultra-short laser pulses has developed into an alternative and energy efficient approach to magnetic recording. Though originally thought to be due to an optically induced effective field, later studies demonstrated that ...

  • Contributed talk

Viktor Kabanov: The correlated random anisotropy model of the Co-organic composite films

We propose the correlated random anisotropy model that describes thin ferromagnetic films hybridized with organic molecular layers. The asymmetry of the molecules leads to the random in-plane anisotropy induced at the surface of the magnetic film. We show that this strongly modifies the magnetic anisotropy of the whole cobalt layer which magnitude critically depends on the correlation radius of random anisotropy (fig. a). When this radius is small even strong induced anisotropy can be neglect...


Free time / Poster Session

Chair: James McIver

  • Invited talk

Gregor Jotzu: Ultrafast Magnetometry of (Light-Induced) Superconductors

Driving certain cuprates and organic materials has been shown to induce THz optical properties reminiscent of superconductivity far above the equilibrium transition temperature. However, the magnetic response of these non-equilibrium states remains unexplored. This study investigates whether these states exhibit a Meissner effect, expelling external magnetic fields, and examines their response to changing magnetic fields on sub-picosecond time scales.Our methodology involves studying the ultr...

  • Invited talk

Andrei Shumilin: Emergent spin phenomena from hyperfine interaction ‌of localized electrons and nuclear spins

Many modern devices are based on the operations with spins. They require the preparation of the initial state: with spin polarization or at least with spin correlations. There is a limited number of conventional methods to achieve this: application of ferromagnetic materials, current to spin conversion due to spin-orbit interaction and static polarization in high magnetic fields. We show the existence of another way to achieve spin polarization in non-magnetic solid-state devices. It requires...

  • Contributed talk

Madhumita Sarkar: Manipulating exciton binding by floquet engineering ‌in Fermi Hubbard ladder

Strong excitations of correlated quantum materials give rise to various non-thermal phases which are not present in their equilibrium counterpart. Recently, it was shown that the one-dimensional Fermi Hubbard Model features charge density wave and η-pairing phases upon photo-doping. In this study, we explore the non-equilibrium behavior of the Fermi Hubbard ladder and employ the Schrieffer-Wolff transformation to map it to a simplified t-J-like model, providing an effective equilibrium descr...

  • Contributed talk

Jaka Strohsack: Influence of Metal/Organic-Molecules Interface on Magnetic Anisotropy ‌in Co Thin Films: A Time-Resolved MOKE Investigation

We investigated by means of the ultrafast time-resolved magneto-optical Kerr effect (MOKE) spectroscopy the effect of the interface between organic molecular semiconductors and cobalt on the magnetic anisotropy of polycrystalline Co thin films. Comparison of the effect was measured on interfaces of Co with: nonmagnetic metal (Al), metalorganic complexes tris(8-hydroxyquinoline)gallium (Gaq3) and M-phthalocyanines (M=Cu, Co) as well as Buckminster-fullerene (C60) molecules.In general, the tra...


Chair: Zala Lenarčič

  • Invited talk

Denis Golez: Chirped amplitude mode in photo-doped superconductors

When a continuous symmetry is spontaneously broken, two types of collective modes emerge: phase and amplitude mode fluctuations of the order parameter. The latter is a massive excitation living at the edge of the gap. Recently, signatures of the amplitude mode were observed in photo-doped superconductors using third-harmonics generation in the terahertz regime, which opened the field of nonlinear light-amplitude mode coupling.We will show that a weak photo-excitation in superconductors leads ...

  • Contributed talk

Carlo Vanoni: A renormalization group analysis of the Anderson model ‌in infinite dimensions

In this talk, I will present a renormalization group analysis of the problem of Anderson localization on Regular Random Graphs (RRGs). I will first review and extend the finite-dimensional analysis of Abrahams, Anderson, Licciardello, and Ramakrishnan in terms of spectral observables, and discuss how to take the large-d limit. I will then motivate that the infinite-dimensional case, relevant also in the context of Many-Body Localization, recovers the Anderson model on RRGs. In this case, the ...

  • Contributed talk

Rafał Świętek: A note on weak eigenstate thermalization and normalization of operators

While the eigenstate thermalization hypothesis (ETH) is well established for quantum-chaotic interacting systems, its validity for other classes of systems remains a matter of intense debate. Focusing on quadratic fermionic Hamiltonians, we here argue that the weak ETH is satisfied for few-body observables in many-body eigenstates of quantum-chaotic quadratic (QCQ) Hamiltonians. In contrast, the weak ETH is violated in two cases: (a) for sums of few-body observables in all quadratic Hamiltoni...

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