Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-07-09
J. Phys. A: Math. Theor. 42 (2009) 392002
Physics
Condensed Matter
Statistical Mechanics
8 pages, 6 figures
Scientific paper
10.1088/1751-8113/42/39/392002
We illustrate recent results concerning the validity of the work fluctuation theorem in open quantum systems [M. Campisi, P. Talkner, and P. H\"{a}nggi, Phys. Rev. Lett. {\bf 102}, 210401 (2009)], by applying them to a solvable model of an open quantum system. The central role played by the thermodynamic partition function of the open quantum system, -- a two level fluctuator with a strong quantum nondemolition coupling to a harmonic oscillator --, is elucidated. The corresponding quantum Hamiltonian of mean force is evaluated explicitly. We study the thermodynamic entropy and the corresponding specific heat of this open system as a function of temperature and coupling strength and show that both may assume negative values at nonzero low temperatures.
Campisi Michele
Hänggi Peter
Talkner Peter
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