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Effects of interaction and polarization on spin-charge separation: A time-dependent spin-density-functional theory study

We calculate the nonequilibrium dynamic evolution of a one-dimensional system of two-component fermionic atoms after a strong local quench by using a time-dependent spin-density-functional theory. The interaction quench is also considered to see its influence on the spin-charge separation. It is shown that the charge velocity is larger than the spin velocity for the system of on-site repulsive interaction (Luttinger liquid), and vise versa for the system of on-site attractive interaction (Luther-Emery liquid). We find that both the interaction quench and polarization suppress the spin-charge separation.

preprint2011arXivOpen access
Gao Xianlong
cond-mat.str-elcond-mat.quant-gas
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Gao Xianlong

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