We consider a ring geometry with a quantum dot (QD) embedded in one of its arms, which is coupled symmetrically to two normal leads and threaded by Aharonov-Bohm (AB) flux φ. The QD is coupled to a topological nanowire. Using scattering matrix method, the differential conductance and current cross correlation are investigated. By varying the external magnetic field strength and the coupling strength between the QD and Majorana bound state (MBS), the zero-bias conductance peak (ZBCP) will split and oscillate due to the overlapping of the two MBSs. Due to the sum rule in a pair of well-separated MBSs, the total differential conductance at zero bias voltage is quantized to 2e²/h. The total differential conductance and the current cross correlation show the periodicity of π with zero QD energy level and 2π with nonzero QD energy level.

我们考虑一个环形几何体，该环形几何体的一个臂中嵌入了一个量子点（QD），该量子点对称地耦合到两条法线，并通过Aharonov-Bohm（AB）通量φ穿过。QD耦合到拓扑纳米线。用散射矩阵法研究了差分电导和电流互相关。通过改变外部磁场强度和QD与马里亚纳束缚态（MBS）之间的耦合强度，零偏置电导峰（ZBCP）将由于两个MBS的重叠而分裂和振荡。由于一对分离良好的MBS中的求和规则，零偏置电压下的总差分电导被量化为2 e ² / h。总微分电导和电流互相关表现的周期性π零QD的能级和2 π具有非零QD的能级。