Thermoelectric signatures of a Majorana bound state coupled to a quantum dot
Thermoelectric signatures of a Majorana bound state coupled to a quantum dot
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DOI：
10.1088/1367-2630/16/1/015029
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发表时间：
2014-01-23
影响因子：
3.3
通讯作者：
Leijnse, Martin
中科院分区：
文献类型：
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作者：
Leijnse, Martin
我们从理论上研究了使用热电测量来检测马约拉纳束缚态并研究它们与耗散环境的耦合的可能性。马约拉纳态的粒子空穴对称性通常会导致塞贝克系数消失，即温度梯度导致的开路电压消失。我们讨论了如何与具有门控能级的量子点耦合以可调谐的方式打破粒子空穴对称性。由此产生的门相关塞贝克系数提供了一种证明马约拉纳态存在的新方法，它可以与相同设置中的传统隧道光谱相结合。此外，热电特性依赖于量子点-马约拉纳系统感知体超导体温度的能力，并可用于提取有关马约拉纳态耗散衰变的信息，这对于量子信息应用至关重要。
We theoretically investigate the possibility to use thermolectric measurements to detect Majorana bound states and to investigate their coupling to a dissipative environment. The particle-hole symmetry of Majorana states would normally lead to a vanishing Seebeck coefficient, i.e. a vanishing open-circuit voltage resulting from a temperature gradient. We discuss how coupling to a quantum dot with a gate-controlled energy level breaks particle-hole symmetry in a tunable manner. The resulting gate-dependent Seebeck coefficient provides a new way to evidence the existence of Majorana states, which can be combined with conventional tunnel spectroscopy in the same setup. Furthermore, the thermoelectric properties rely on the ability of the quantum dot-Majorana system to sense the temperature of the bulk superconductor and can be used to extract information about the dissipative decay of Majorana states, which is crucial for quantum information applications.