Quantum Otto engine of a two-level atom with single-mode fields.
We establish a quantum Otto engine (QOE) of a two-level atom, which is confined in a one-dimensional (1D) harmonic trap and is coupled to single-mode radiation fields. Besides two adiabatic processes, the QOE cycle consists of two isochoric processes, along one of which the two-level atom as the working substance interacts with a single-mode radiation field. Based on the semigroup approach, we derive the time for completing any adiabatic process and then present a performance analysis of the heat engine model. Furthermore, we generalize the results to the performance optimization for a QOE of a single two-level atom trapped in a 1D power-law potential. Our result shows that the efficiency at maximum power output is dependent on the trap exponent θ but is independent of the energy spectrum index σ.
Department of Physics, Nanchang University, Nanchang 330031, China. physwjh@gmail.com
Jianhui
J
Wang
Zhaoqi
Z
Wu
Jizhou
J
He
D003198:Computer Simulation; D004735:Energy Transfer; D008956:Models, Chemical; D011789:Quantum Theory; D013816:Thermodynamics