Managing Quantum Heat Transfer in a Nonequilibrium Qubit-Phonon Hybrid System with Coherent Phonon States |
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Authors: | Chen Wang Lu-Qin Wang Jie Ren |
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Institution: | (Department of Physics,Zhejiang Normal University,Jinhua 321004,China;Center for Phononics and Thermal Energy Science,China-EU Joint Center for Nanophononics,Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,School of Physics Sciences and Engineering,Tongji University,Shanghai 200092,China) |
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Abstract: | We investigate quantum heat transfer in a nonequilibrium qubit-phonon hybrid open system,dissipated by external bosonic thermal reservoirs.By applying coherent phonon states embedded in the dressed quantum master equation,we are capable of dealing with arbitrary qubit-phonon coupling strength.It is counterintuitively found that the effect of negative differential thermal conductance is absent at strong qubit-phonon hybridization,but becomes profound at weak qubit-phonon coupling regime.The underlying mechanism of decreasing heat flux by increasing the temperature bias relies on the unidirectional transitions from the up-spin displaced coherent phonon states to the down-spin counterparts,which seriously freezes the qubit and prevents the system from completing a thermodynamic cycle.Finally,the effects of perfect thermal rectification and giant heat amplification are unraveled,thanks to the effect of negative differential thermal conductance.These results of the nonequilibrium qubit-phonon open system would have potential implications in smart energy control and functional design of phononic hybrid quantum devices. |
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