Derivation of quantum master equation with counting fields by monitoring a probe

Details Derivation of quantum master equation with counting fields by monitoring a probe Derivation of quantum master equation with counting fields by monitoring a probe

2010-09-08

arxiv.org/abs/1009.1428v2

Physics

Condensed Matter

Statistical Mechanics

7 pages

Scientific paper

We show a microscopic derivation of a quantum master equation with counting terms which describes the electron statistics. A localized spin behaves as a probe whose precession angle monitors the net electron current by the magnetic-moment interaction. The probe Hamiltonian is proportional to the current, and is determined self-consistently for a model of a quantum dot. Then it turns out that the quantum master equation for the spin-precession contains the counting terms. As an application, we show the fluctuation theorem for the electron current.

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