Volume 78, Number 1, April 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||15 March 2007|
Role of symmetry in the interplay of quantum-phase transitions with unconventional transport properties in integrable quantum lattice systems
GCEP-Center of Physics, U. Minho, Campus Gualtar - P-4710-057 Braga, Portugal
2 Massachusetts Institute of Technology - Cambridge, MA 02139-4307, USA
3 Department of Physics and ITP, The Chinese University of Hong Kong - Hong Kong, China
Corresponding author: email@example.com
Accepted: 13 February 2007
We show that a generalized charge symmetry of the one-dimensional (1D) Hubbard model in an infinitesimal flux generates half-filling states from metallic states which lead to a finite charge stiffness 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 transport properties and the interplay with 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.
PACS: 72.10.-d – Theory of electronic transport; scattering mechanisms / 71.27.+a – Strongly correlated electron systems; heavy fermions / 05.60.Gg – Quantum transport
© Europhysics Letters Association, 2007
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