We study theoretically the properties of local heat originated from energy exchange between electrons passing through a quantum dot (QD) coupled to a phonon bath. The dot is sandwiched between two normal metal leads and also side-coupled to Majorana bound states (MBSs) formed at opposite ends of a topological superconductor nanowire. We find that in addition to the negative differential of heat generation (NDHG) in the Coulomb blockade regime, another NDHG emerges near the leads' Fermi level due to the dot-MBS coupling. This dual NDHG effect is robust against the variation of intradot Coulomb interaction strength, and disappears if the QD is coupled to regular Fermions. Direct hybridization between the MBSs reduces their impacts on the electronic transport processes, and eliminates the dual NDHG effect. Our results show that the dual NDHG effect is quite efficiency for inferring the existence of MBSs, and may remedy some limitations of the detection schemes relying on tunneling spectroscopy technique.

中文翻译：

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侧耦合到马约拉纳束缚态的强相关量子点中发热的双重负微分

我们从理论上研究了局部热的特性，这些特性源自电子之间通过与声子浴耦合的量子点 (QD) 之间的能量交换。该点夹在两个普通金属引线之间，并且侧面耦合到形成在拓扑超导体纳米线两端的马约拉纳束缚态 (MBS)。我们发现，除了库仑阻滞机制中的负发热差异 (NDHG) 之外，由于点-MBS 耦合，在引线的费米能级附近出现了另一种 NDHG。这种双重 NDHG 效应对于点内库仑相互作用强度的变化是稳健的，如果 QD 与常规费米子耦合，则这种效应会消失。MBS 之间的直接杂交减少了它们对电子传输过程的影响，并消除了双重 NDHG 效应。