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Lukin, Alexander

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Lukin, Alexander

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2019 - 201912020 - 20231

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Author's Publications: search.filters.isAuthorOfPublication.05e77862-27b7-4343-b7e1-d2061d29a80d

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    Probing the Onset of Quantum Avalanches in a Many-Body Localized System
    (Springer Science and Business Media LLC, 2023-01-26) Leonard, Julian; Kim, Sooshin; Rispoli, Matthew; Lukin, Alexander; Schittko, Robert; Kwan, Joyce; Demler, Eugene; Sels, Dries; Greiner, Markus
    Strongly correlated systems can exhibit unexpected phenomena when brought in a state far from equilibrium. An example is many-body localization, which prevents generic interacting systems from reaching thermal equilibrium even at long times. The stability of the many-body-localized phase has been predicted to be hindered by the presence of small thermal inclusions that act as a bath, leading to the delocalization of the entire system through an avalanche propagation mechanism. Here we study the dynamics of a thermal inclusion of variable size when it is coupled to a many-body-localized system. We find evidence for accelerated transport of the thermal inclusion into the localized region. We monitor how the avalanche spreads through the localized system and thermalizes it site by site by measuring the site-resolved entropy over time. Furthermore, we isolate the strongly correlated bath-induced dynamics with multipoint correlations between the bath and the system. Our results have implications on the robustness of many-body localized systems and their critical behavior.
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    Quantum Critical Behaviour at the Many-Body Localization Transition
    (Springer Science and Business Media LLC, 2019-09) Rispoli, Matthew; Lukin, Alexander; Schittko, Robert; Kim, Sooshin; Tai, M. Eric; Greiner, Markus; Léonard, Julian
    Phase transitions are driven by collective fluctuations of a system's constituents that emerge at a critical point. This mechanism has been extensively explored for classical and quantum systems in equilibrium, whose critical behavior is described by a general theory of phase transitions. Recently, however, fundamentally distinct phase transitions have been discovered for out-of-equilibrium quantum systems, which can exhibit critical behavior that defies this description and is not well understood. A paradigmatic example is the many-body-localization (MBL) transition, which marks the breakdown of quantum thermalization. Characterizing quantum critical behavior in an MBL system requires the measurement of its entanglement properties over space and time, which has proven experimentally challenging due to stringent requirements on quantum state preparation and system isolation. Here, we observe quantum critical behavior at the MBL transition in a disordered Bose-Hubbard system and characterize its entanglement properties via its quantum correlations. We observe strong correlations, whose emergence is accompanied by the onset of anomalous diffusive transport throughout the system, and verify their critical nature by measuring their system-size dependence. The correlations extend to high orders in the quantum critical regime and appear to form via a sparse network of many-body resonances that spans the entire system. Our results unify the system's microscopic structure with its macroscopic quantum critical behavior, and they provide an essential step towards understanding criticality and universality in non-equilibrium systems.