Spin-charge separation effects in the low-temperature transport of one-dimensional Fermi gases
ID Mestyán, Márton (Author), ID Bertini, Bruno (Author), ID Piroli, Lorenzo (Author), ID Calabrese, Pasquale (Author)

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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:nonequilibrium statistical mechanics, quantum statistical mechanics, Fermi gas
Typology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Publication status:Published
Publication version:Author Accepted Manuscript
Number of pages:Str. 014305-1-014305-19
Numbering:Vol. 99, iss. 1
PID:20.500.12556/RUL-107806 This link opens in a new window
ISSN on article:2469-9950
DOI:10.1103/PhysRevB.99.014305 This link opens in a new window
COBISS.SI-ID:3313252 This link opens in a new window
Publication date in RUL:27.05.2019
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Record is a part of a journal

Title:Physical review
Publisher:American Physical Society
COBISS.SI-ID:2997348 This link opens in a new window

Secondary language

Keywords:neravnovesna statistična mehanika, kvantna statistična mehanika, Fermijev plin


Funder:EC - European Commission
Funding programme:H2020
Project number:694544
Name:Open many-body non-equilibrium systems

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