Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G50: Quantum Thermalization Dynamics
11:30 AM–2:30 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-474A
Sponsoring
Unit:
DCMP
Chair: Michael Lilly, Sandia National Laboratories
Abstract: G50.00012 : Classification of Non-Interacting Quantum Baths: Reconstruction of the Influence Matrix from Keldysh Correlation Functions*
1:42 PM–1:54 PM
Presenter:
Julian Thoenniss
(University of Geneva)
Authors:
Julian Thoenniss
(University of Geneva)
Alessio Lerose
(Univ of Geneva)
Michael Sonner
(Univ of Geneva)
Dmitry A Abanin
(University of Geneva)
While a self-consistent approach to the computation of the IM using tensor-network techniques has proven to be versatile and efficient, a deeper analytical insight into the structure of IM is desirable to describe and classify quantum many body baths. In this talk, I will present a complementary perspective in which the IM is viewed as generating functional for Keldysh correlation functions. By computing these correlation functions explicitly, we reconstruct the IM for generic non-interacting systems of fermions. We will discuss the entanglement scaling of IM, as well as the dynamical properties of the resulting bath depending on the fermions spectral properties.
*This work was supported by the Swiss National ScienceFoundation and by the European Research Council (ERC)under the European Union’s Horizon 2020 research andinnovation program (Grant Agreement No. 864597).
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