Fate of 1D spin-charge separation away from Fermi points.
We consider the dynamic response functions of interacting one dimensional spin-1/2 fermions at arbitrary momenta. We build a nonperturbative zero-temperature theory of the threshold singularities using mobile impurity Hamiltonians. The interaction induced low-energy spin-charge separation and power-law threshold singularities survive away from Fermi points. We express the threshold exponents in terms of the spinon spectrum.
Schmidt
Thomas L
TL
Department of Physics, Yale University, 217 Prospect Street, New Haven, Connecticut 06520, USA.
Imambekov
Adilet
A
Glazman
Leonid I
LI