Reference : Universal scaling of quench-induced correlations in a one-dimensional channel at fini...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/34918
Universal scaling of quench-induced correlations in a one-dimensional channel at finite temperature
English
Calzona, Alessio mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > >]
Gambetta, Filippo Maria mailto []
Carrega, Matteo mailto []
Cavaliere, Fabio mailto []
Schmidt, Thomas mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Sassetti, Maura mailto []
10-May-2018
SciPost Physics
SciPost Foundation
Yes (verified by ORBilu)
International
2542-4653
Amsterdam
Netherlands
[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.
http://hdl.handle.net/10993/34918

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
1711.02967.pdfAuthor postprint1.19 MBView/Open

Bookmark and Share SFX Query

All documents in ORBilu are protected by a user license.