Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-10-24
Europhys. Lett. 78, 17005 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 4 figures
Scientific paper
10.1209/0295-5075/78/17005
We show that a generalized charge SU(2) symmetry of the one-dimensional (1D) Hubbard model in an infinitesimal flux $\phi$ generates half-filling states from metallic states which lead to a finite charge stiffness $D(T)$ at finite temperature $T$, whose $T$ dependence we study. Our results are of general nature for many integrable quantum lattice systems, reveal the microscopic mechanisms behind their exotic $T>0$ transport properties and the interplay with T=0 quantum-phase transitions, and contribute to the further understanding of the transport of charge in systems of interacting ultracold fermionic atoms in 1D optical lattices, quasi-1D compounds, and 1D nanostructures.
Carmelo Jose. M. P.
Gu Shi-Jian
Peres Nuno. M. R.
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