Majorana RC电路的电荷电阻
Charge Resistance in a Majorana RC circuit
摘要：
我们研究了介观拓扑超导体两端的两个马约拉纳束缚态所实现的“马约拉纳库仑盒”中的动态电荷响应。导线的一侧耦合到正常引线，低频栅极电压施加到系统。没有直流电流，该系统可以被认为是一个RC量子线路。计算了等效电容和电荷弛豫电阻。后者与柯林加-柴场公式一致，但其中电荷弛豫电阻等于h/2e^2。该值对应于Fu [PRL 104，056402（2010）]制定的共振模型所描述的强库仑阻塞极限。我们还进行了直接计算，使用后者的模型，并定义其参数直接与我们的微扰理论的结果进行比较。
英文摘要：
We investigate the dynamical charge response in a "Majorana Coulomb box" realized by two Majorana bound states hosted at the ends of a mesoscopic topological superconductor. One side of the wire is coupled to a normal lead and low frequency gate voltage is applied to the system. There is no dc-current; the system can be considered as an RC quantum circuit. We calculate the effective capacitance and charge relaxation resistance. The latter is in agreement with the Korringa-Shiba formula where, however, the charge relaxation resistance is equal to h/2e^2. This value corresponds to the strong Coulomb blockade limit described by a resonant model formulated by Fu [PRL 104, 056402 (2010)]. We also performed direct calculations using the latter model and defined its parameters by direct comparison with our perturbation theory results.
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