Article (Scientific journals)
Universal scaling of quench-induced correlations in a one-dimensional channel at finite temperature
Calzona, Alessio; Gambetta, Filippo Maria; Carrega, Matteo et al.
2018In SciPost Physics
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Abstract :
[en] It has been shown that a quantum quench of interactions in a one-dimensional fermion system at zero temperature induces a universal power law ∝t−2 in its long-time dynamics. In this paper we demonstrate that this behaviour is robust even in the presence of thermal effects. The system is initially prepared in a thermal state, then at a given time the bath is disconnected and the interaction strength is suddenly quenched. The corresponding effects on the long times dynamics of the non-equilibrium fermionic spectral function are considered. We show that the non-universal power laws, present at zero temperature, acquire an exponential decay due to thermal effects and are washed out at long times, while the universal behaviour ∝t−2 is always present. To verify our findings, we argue that these features are also visible in transport properties at finite temperature. The long-time dynamics of the current injected from a biased probe exhibits the same universal power law relaxation, in sharp contrast with the non-quenched case which features a fast exponential decay of the current towards its steady value, and thus represents a fingerprint of quench-induced dynamics. Finally, we show that a proper tuning of the probe temperature, compared to that of the one-dimensional channel, can enhance the visibility of the universal power-law behaviour.
Disciplines :
Physics
Author, co-author :
Calzona, Alessio ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC)
Gambetta, Filippo Maria
Carrega, Matteo
Cavaliere, Fabio
Schmidt, Thomas ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Sassetti, Maura
External co-authors :
yes
Language :
English
Title :
Universal scaling of quench-induced correlations in a one-dimensional channel at finite temperature
Publication date :
10 May 2018
Journal title :
SciPost Physics
ISSN :
2542-4653
Publisher :
SciPost Foundation, Amsterdam, Netherlands
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 18 February 2018

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