Managing Quantum Heat Transfer in a Nonequilibrium Qubit-Phonon Hybrid System with Coherent Phonon States  

作　　者：Chen Wang Lu-Qin Wang Jie Ren 王晨;王鲁钦;任捷(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)

机构地区：[1]Department of Physics,Zhejiang Normal University,Jinhua 321004,China [2]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

出　　处：《Chinese Physics Letters》2021年第1期10-18,共9页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant No.11704093);the National Natural Science Foundation of China(Grant Nos.11935010 and 11775159);the Opening Project of Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology;the Natural Science Foundation of Shanghai(Grant Nos.18ZR1442800 and 18JC1410900)。

摘　　要：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.

关 键 词：PHONON QUANTUM coherent 

分 类 号：O413[理学—理论物理]