Heat transport in quantum spin chains - Stochastic baths vs quantum trajectories

Autor(en): Mejia-Monasterio, C.
Wichterich, H.
Stichwörter: CHAOS; DRUDE WEIGHT; ENERGY-TRANSPORT; FINITE TEMPERATURES; FOURIERS LAW; MODEL; OPTICS; OSCILLATORS; Physics; Physics, Multidisciplinary; SYSTEM; THERMAL-CONDUCTIVITY
Erscheinungsdatum: 2007
Herausgeber: SPRINGER HEIDELBERG
Journal: EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
Volumen: 151
Startseite: 113
Seitenende: 125
Zusammenfassung: 
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.
ISSN: 19516355
DOI: 10.1140/epjst/e2007-00367-4

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