Heat Transport in Quantum Spin Chains: Stochastic Baths vs Quantum Trajectories

Details Heat Transport in Quantum Spin Chains: Stochastic Baths vs Quantum Trajectories Heat Transport in Quantum Spin Chains: Stochastic Baths vs Quantum Trajectories

2007-09-10

arxiv.org/abs/0709.1412v1

Eur. Phys. J. ST 151, 113 (2007)

Physics

Condensed Matter

Statistical Mechanics

13 pages, 5 figures, submitted to European Physics Journal Special Topics

Scientific paper

10.1140/epjst/e2007-00367-4

We discuss the problem of heat conduction in quantum spin chain models. To investigate this problem it is necessary to consider the finite open system connected to heat baths. We describe two different procedures to couple the system with the reservoirs: a model of stochastic heat baths and the quantum trajectories solution of the quantum master equation. The stochastic heat bath procedure operates on the pure wave function of the isolated system, so that it is locally and periodically collapsed to a quantum state consistent with a boundary nonequilibrium state. In contrast, the quantum trajectories procedure evaluates ensemble averages in terms of the reduced density matrix operator of the system. We apply these procedures to different models of quantum spin chains and numerically show their applicability to study the heat flow.

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