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 G66: Open Quantum Systems I
11:30 AM–2:42 PM,
Tuesday, March 7, 2023
Room: Room 413
Sponsoring
Unit:
DAMOP
Chair: Federico Roccati, University of Luxembourg
Abstract: G66.00007 : Relaxation and time scales in disordered XX model with on-site dephasing*
1:06 PM–1:18 PM
Presenter:
Roopayan Ghosh
(University College London)
Authors:
Roopayan Ghosh
(University College London)
Marko Znidaric
(University of Ljubljana)
The relaxation of observables to their non-equilibrium steady states in a disordered XX chain subjected to dephasing at every site has been intensely studied in recent years. In our work, we seek to demystify the relaxation of `Imbalance' in such a system, using a comprehensive analysis supported by analytics, and numerical simulations at large system sizes. Using two/three-site models, we can analytically predict emergence of several timescales in the system and extract results which match with numerics very closely without any extra fitting parameters. Then for long timescales, studying the low-energy eigenspectrum of the Liouvillian shows us that the decay is a power law, akin to clean systems, with the exponent depending on factors such as boundary conditions, which matches with exact numerical data. The final phase of relaxation is governed by the relevant lowest magnitude Liouvillian gap, as expected for finite sized systems.
*Support from Grants No. J1-1698 and No. P1-0402 from the Slovenian Research Agency is acknowledged. Travel funding from UKRI grant EP/R029075/1 is acknowledged.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700