Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00048 : Numerical renormalization group study of Loschmidt echo in Kondo system
Presenter:
Kacper Wrzesniewski
(Adam Mickiewicz University)
Authors:
Kacper Wrzesniewski
(Adam Mickiewicz University)
Tomasz Slusarski
(Adam Mickiewicz University)
Ireneusz Weymann
(Adam Mickiewicz University)
We analyze time evolution of the Loschmidt echo following a quench in Hamiltonian variables of the Kondo system. Firstly, we study the one-channel Kondo model and find the universal behavior of the Loschmidt echo. Here, the relevant time scale is given by the inverse of the Kondo temperature. For the two-channel model, we focus on the quench leading to the formation of the non-Fermi liquid state and discuss the relevant dynamics. Furthermore, we study the case when the system initially prepared in Fermi liquid phase is suddenly coupled to the second screening channel. A new time scale emerges, which is associated with the channel anisotropy.
Finally, we study the post-quench dynamical behavior of the Kondo system in the presence of external magnetic field. Time dependence of the impurity’s magnetization sheds new light on identification of the relevant time scales in the dynamics.
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