Negative differential conductivity in Heisenberg XXZ chain far from equilibrium

Details Negative differential conductivity in Heisenberg XXZ chain far from equilibrium Negative differential conductivity in Heisenberg XXZ chain far from equilibrium

2007-04-17

arxiv.org/abs/0704.2252v1

Physics

Quantum Physics

Unpublished notes, written up in February 2004, 5 pages with 3 .eps figures

Scientific paper

Negative differential conductivity is reported for the far from equilibrium
quantum spin transport in the insulating regime (J_x < J_z) of finite
Heisenberg XXZ spin 1/2 chains. The phenomenon is reproduced analytically for
small chains of N=4 spins and further analyzed numerically, for up to N=16,
using an efficient pure-state simulation with stochastic spin baths.

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