Signatures of bath-induced quantum avalanches in a many-body--localized system

• URL: http://arxiv.org/abs/2012.15270v2
• Date: Fri, 18 Nov 2022 08:19:24 GMT
• Title: Signatures of bath-induced quantum avalanches in a many-body--localized system
• Authors: Julian L\'eonard, Sooshin Kim, Matthew Rispoli, Alexander Lukin, Robert Schittko, Joyce Kwan, Eugene Demler, Dries Sels, and Markus Greiner
• Abstract summary: Quantum avalanches occur when the system is locally coupled to a small thermal inclusion that acts as a bath. We realize an interface between a many-body--localized system and a thermal inclusion of variable size, and study its dynamics.
• Score: 47.187609203210705
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Strongly correlated systems can exhibit surprising phenomena when brought in a state far from equilibrium. A spectacular example are quantum avalanches, that have been predicted to run through a many-body--localized system and delocalize it. Quantum avalanches occur when the system is locally coupled to a small thermal inclusion that acts as a bath. Here we realize an interface between a many-body--localized system and a thermal inclusion of variable size, and study its dynamics. We find evidence for accelerated transport into the localized region, signature of a quantum avalanche. By measuring the site-resolved entropy we monitor how the avalanche travels through the localized system and thermalizes it site by site. Furthermore, we isolate the bath-induced dynamics by evaluating multipoint correlations between the bath and the system. Our results have fundamental implications on the robustness of many-body--localized systems and their critical behavior.

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