Spin-charge separation effects in the low-temperature transport of 1D Fermi gases

Understand

We study the transport properties of a one-dimensional spinful Fermi gas, after junction of two semi-infinite sub-systems held at different temperatures.

• The ensuing dynamics is studied by analysing the space-time profiles of local observables emerging at large distances $x$ and times $t$, as a function of $\zeta = x/t$.
• At equilibrium, the system displays two distinct species of quasi-particles, naturally associated with different physical degrees of freedom.
• By employing the generalised hy- drodynamic approach, we show that when the temperatures are finite no notion of separation can be attributed to the quasi-particles.