Negative differential conductivity in Heisenberg XXZ chain far from equilibrium
Abstract
Negative differential conductivity is reported for the far from equilibrium quantum spin transport in the insulating regime (Jx < Jz) 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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