Bath generated work extraction in two-level systems

Details Bath generated work extraction in two-level systems Bath generated work extraction in two-level systems

2002-08-28

arxiv.org/abs/cond-mat/0208565v1

Physics

Condensed Matter

Statistical Mechanics

5 pages Latex, uses aip-proceedings style files. Proceedings `Quantum Limits to the Second Law', San Diego, July 2002

Scientific paper

10.1063/1.1523813

The spin-boson model, often used in NMR and ESR physics, quantum optics and spintronics, is considered in a solvable limit to model a spin one-half particle interacting with a bosonic thermal bath. By applying external pulses to a non-equilibrium initial state of the spin, work can be extracted from the thermalized bath. It occurs on the timescale T_2 inherent to transversal (`quantum') fluctuations. The work (partly) arises from heat given off by the surrounding bath, while the spin entropy remains constant during a pulse. This presents a violation of the Clausius inequality and the Thomson formulation of the second law (cycles cost work) for the two-level system.

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