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

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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.

Language:English
Keywords:nonequilibrium statistical mechanics, quantum statistical mechanics, Fermi gas
Tipology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Year:2019
Number of pages:Str. 014305-1-014305-19
Numbering:Vol. 99, iss. 1
UDC:536.93
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
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Downloads:386
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Record is a part of a journal

Title:Physical review
Publisher:American Physical Society
ISSN:2469-9950
COBISS.SI-ID:2997348 This link opens in a new window

Document is financed by a project

Funder:EC - European Commission
Funding Programme:H2020
Project no.:694544
Name:Open many-body non-equilibrium systems
Acronym:OMNES

Secondary language

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

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