Márton Mestyán (Author), Bruno Bertini (Author), Lorenzo Piroli (Author), Pasquale Calabrese (Author)

Abstract

We study the transport properties of a one-dimensional spinful Fermi gas, after a junction of two semi-infinite subsystems held at different temperatures. The ensuing dynamics is studied by analyzing the space-time profiles of local observables emerging at large distances x and times t, as a function of ζ = x/t. At equilibrium, the system displays two distinct species of quasiparticles, naturally associated with different physical degrees of freedom. By employing the generalized hydrodynamic approach, we show that when the temperatures are finite no notion of separation can be attributed to the quasiparticles. In this case, the profiles can not be qualitatively distinguished by those associated to quasiparticles of a single species that can form bound states. On the contrary, signatures of separation emerge in the low-temperature regime, where two distinct characteristic velocities appear. In this regime, we analytically show that the profiles display a piecewise constant form and can be understood in terms of two decoupled Luttinger liquids.

Keywords

neravnovesna statistična mehanika;kvantna statistična mehanika;Fermijev plin;nonequilibrium statistical mechanics;quantum statistical mechanics;Fermi gas;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FMF - Faculty of Mathematics and Physics
UDC: 536.93
COBISS: 3313252 Link will open in a new window
ISSN: 2469-9950
Views: 691
Downloads: 460
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Other data

Secondary language: Slovenian
Secondary keywords: neravnovesna statistična mehanika;kvantna statistična mehanika;Fermijev plin;
Pages: str. 014305-1-014305-19
Volume: ǂVol. ǂ99
Issue: ǂiss. ǂ1
Chronology: 2019
DOI: 10.1103/PhysRevB.99.014305
ID: 11146009