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DTSTART;TZID=Europe/Paris:20240702T140000
DTEND;TZID=Europe/Paris:20240702T153000
DTSTAMP:20260417T185002
CREATED:20240630T060052Z
LAST-MODIFIED:20240701T072623Z
UID:10899-1719928800-1719934200@fermi.univ-tlse3.fr
SUMMARY:Échelle réglable de protection topologique dans un réseau triangulaire d’atomes de Rydberg. - (Pranay Patil / LPT / Seminar). - 2/07/2024\, 14H
DESCRIPTION:Pranay Patil (OIST\, Japon) \nSeminar LPT\, 2/07/2024\, 14H\, 3R1\, seminar room\, 3rd floor \nAbstract :\nRydberg atom arrays have recently been conjectured to host Z2 quantum spin liquids in certain parameter regimes. Due to the strong interactions between these atoms\, it is not possible to analytically study these systems\, and one must resort to Monte Carlo sampling of the path integral to reach definite conclusions. We use an update to sample the configuration space which is specifically designed to target the low energy excitation of the expected QSL. This allows us to reliably simulate Rydberg atoms on a triangular lattice in this regime and identify a correlated paramagnetic phase at low temperatures which hosts topological protection similar to a Z2 spin liquid up to a length scale tuned by Hamiltonian parameters. This result indicates the feasibility of Rydberg atom arrays to act as topological qubits. \n
URL:https://fermi.univ-tlse3.fr/event/echelle-reglable-de-protection-topologique-dans-un-reseau-triangulaire-datomes-de-rydberg-pranay-patil-lpt-seminar-2-07-2024-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20240711T140000
DTEND;TZID=Europe/Paris:20240711T153000
DTSTAMP:20260417T185002
CREATED:20240704T054950Z
LAST-MODIFIED:20240708T120000Z
UID:10901-1720706400-1720711800@fermi.univ-tlse3.fr
SUMMARY:Description exacte du transport dans les résistances stochastiques quantiques et les dispositifs contrôlés. - (Michele Filippone / LPT / Seminar). - 11/07/2024\, 14H
DESCRIPTION:Michele Filippone (CEA Grenoble) \nSeminar LPT\, 11/07/2024\, 14H\, 3R1\, seminar room\, 3rd floor \nAbstract : \n\nUnderstanding the emergence of diffusion in quantum systems remains a challenging problem in theoretical physics. An extended class of models expected to exhibit diffusive behavior is given by Quantum Stochastic Hamiltonians (QSHs)\, which describe lattice models affected by time- and space-dependent noise. However\, the averaged dynamics of such models are governed by non-linear Lindblad equations\, whose theoretical study usually relies on numerical methods or case-by-case solutions\, with strong constraints on geometries and driving protocols. \nIn this talk\, I will present a systematic method to derive exact and analytical solutions for the stationary quantum transport of QSHs in arbitrary configurations [1]. Our solution is based on an exact self-consistent Born scheme for diagrammatics in the Keldysh representation [2]. We show that most QSHs behave as diffusive « quantum stochastic resistors\, » whose properties are encoded in the Keldysh component of the single-particle Green’s function. I will provide a semi-classical interpretation of such systems [3]\, and in particular\, I will discuss how our exact solution demonstrates the validity of a new perturbation scheme in the inverse system size\, named the 1/N expansion\, to study out-of-equilibrium diffusive/ohmic systems. \nI will conclude by discussing how our approach can be extended to describe quantum transport in continuously monitored settings. I will show that measurements trigger non-reciprocal currents in quantum devices\, thus acting as a resource for power generation and quantum measurement cooling [4]. \n\n[1] T. Jin\, J. S. Ferreira\, M. Filippone\, T. Giamarchi\, Physical Review Research 4\, 013109 (2022)\n[2] P. E. Dolgirev\, J. Marino\, D. Sels\, E. Demler\, Physical Review B 102\, 100301 (2020)\n[3] T. Jin\, J. S. Ferreira\, M. Filippone\, T. Giamarchi\, Physical Review Research 5\, 013033 (2023)\n[4] J. S. Ferreira\, T. Jin\, J. Mannhart\, T. Giamarchi\, M. Filippone\, Physical Review Letters 132\, 136301 (2024) – Editors’ Suggestion\n\n\n \n
URL:https://fermi.univ-tlse3.fr/event/description-exacte-du-transport-dans-les-resistances-stochastiques-quantiques-et-les-dispositifs-controles-michele-filippone-lpt-seminar-9-07-2024-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
END:VEVENT
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