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Title: Charge and spin transport in strongly correlated one-dimensional quantum systems driven far from equilibrium
Authors: Benenti, G.
Casati, G. 
Prosen, T.
Rossini, D.
Žnidarič, M.
Issue Date: 6-Aug-2009
Citation: Benenti, G., Casati, G., Prosen, T., Rossini, D., Žnidarič, M. (2009-08-06). Charge and spin transport in strongly correlated one-dimensional quantum systems driven far from equilibrium. Physical Review B - Condensed Matter and Materials Physics 80 (3) : -. ScholarBank@NUS Repository.
Abstract: We study the charge conductivity in one-dimensional prototype models of interacting particles, such as the Hubbard and the t-V spinless fermion models, when coupled to some external baths injecting and extracting particles at the boundaries. We show that, if these systems are driven far from equilibrium, a negative differential conductivity regime can arise. The above electronic models can be mapped into Heisenberg-like spin ladders coupled to two magnetic baths, so that charge transport mechanisms are explained in terms of quantum spin transport. The negative differential conductivity is due to oppositely polarized ferromagnetic domains that arise at the edges of the chain and therefore inhibit spin transport: we propose a qualitative understanding of the phenomenon by analyzing the localization of one-magnon excitations created at the borders of a ferromagnetic region. We also show that negative differential conductivity is stable against breaking of integrability. Numerical simulations of nonequilibrium time evolution have been performed by employing a Monte Carlo wave function approach and a matrix product operator formalism. © 2009 The American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.80.035110
Appears in Collections:Staff Publications

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