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Negative differential thermal conductance and heat amplification in a nonequilibrium triangle-coupled spin-boson system at strong coupling

机译:a。负微分热导和热放大   非耦合的非平衡三角耦合自旋玻色子系统

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摘要

We investigate the nonequilibrium quantum heat transfer in a triangle-coupledspin-boson system within a three-terminal setup. By including thenonequilibrium noninteracting blip approximation approach combined with thefull counting statistics, we analytically obtain the steady state populationsand heat currents. The negative differential thermal conductance and giant heatamplification factor are clearly observed at strong qubit-bath coupling. %andthe heat amplification is dramatically suppressed in the moderate couplingregime. Moreover, the strong interaction between the gating qubit and gatingthermal bath is unraveled to be compulsory to exhibit these far-fromequilibrium features.
机译:我们研究了三端设置内三角耦合自旋玻色子系统中的非平衡量子传热。通过将非平衡非相互作用的斑点逼近方法与全计数统计相结合,我们可以分析得出稳态种群和热流。在强的量子比特-浴耦合下清楚地观察到负差分导热系数和巨大的热放大系数。在中等耦合条件下,热放大被显着抑制。而且,阐明了选通量子位和选通热浴之间的强相互作用是强制性的,以表现出这些远离平衡的特征。

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