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Quantum thermal diode with additional control by auxiliary atomic states
Qin Zhang1, Zi-Chen Zhang1, Yi-Jia Yang1
1Dalian University of Technology, School of Physics, Dalian 116024, China.
Abstract:
A quantum thermal diode, similar to an electronic diode, allows for unidirectional heat transmission. In this paper, we study a quantum thermal diode composed of two two-level atoms coupled to auxiliary two-level atoms. We find that while excited (ground-state) auxiliary atoms weaken (enhance) the heat current, the rectification is dictated by the left-right atomic frequency relationship. The more auxiliary atoms are coupled, the stronger the enhancing or weakening impact is. If the auxiliary atom is in a superposition state, we find that only the fraction that projects onto the excited state plays a significant role. In particular, if we properly design the coupling of the auxiliary atoms, the rectification effect can be eliminated. This provides the potential to control the heat current and the rectification performance by the states of the auxiliary atoms.
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