Article
Entangled quantum heat engines based on two twospin systems with DzyaloshinskiMoriya anisotropic antisymmetric interaction
The European Physical Journal D (Impact Factor: 1.51). 01/2008; 49(1):123128. DOI: 10.1140/epjd/e2008001330
Source: arXiv

Article: Nonequilibrium reversible dynamics of work production in fourspin system in a magnetic field
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ABSTRACT: A closed system of the equations for the local Bloch vectors and spin correlation functions is obtained by decomplexification of the Liouvillevon Neumann equation for 4 magnetic particles with the exchange interaction that takes place in an arbitrary timedependent external magnetic field. The analytical and numerical analysis of the quantum thermodynamic variables is carried out depending on separable mixed initial state and the magnetic field modulation. Under unitary evolution, nonequilibrium reversible dynamics of power production in the finite environment is investigated.01/2009;  [Show abstract] [Hide abstract]
ABSTRACT: A model of an irreversible quantum Carnot heat engine with heat resistance, internal irreversibility and heat leakage and many noninteracting harmonic oscillators is established in this paper. Based on the quantum master equation and semigroup approach, equations of some important performance parameters, such as power output, efficiency, exergy loss rate and ecological function for the irreversible quantum Carnot heat engine are derived. The optimal ecological performance of the heat engine in the classical limit is analyzed with numerical examples. Effects of internal irreversibility and heat leakage on the ecological performance are discussed. A performance comparison of the quantum heat engine under maximum ecological function and maximum power conditions is also performed.Science in China Series G Physics Mechanics and Astronomy 01/2009; 52(12):19761988. · 1.41 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Based on a twoqubit isotropic Heisenberg XXX model with a constant external magnetic field, we construct a fourlevel entangled quantum heat engine (QHE). The expressions for several thermodynamic quantities such as the heat transferred, the work and efficiency are derived. Moreover, the influence of the entanglement on the thermodynamic quantities is investigated analytically and numerically. Several interesting features of the variation of the heat transferred, the work and the efficiency with the concurrences of the thermal entanglement of different thermal equilibrium states are obtained.Science China: Physics, Mechanics and Astronomy 55(10). · 1.17 Impact Factor
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