Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure*

Abstract

We theoretically study the transport properties in the T-shaped double-quantum-dot structure, by considering the dot in the main channel to be coupled to the Majorana bound state (MBS) at one end of the topological superconducting nanowire. It is found that the side-coupled dot governs the effect of the MBS on the transport behavior. When its level is consistent with the energy zero point, the MBS contributes little to the conductance spectrum. Otherwise, the linear conductance exhibits notable changes according to the inter-MBS coupling manners. In the absence of inter-MBS coupling, the linear conductance value keeps equal to e 2/2h when the level of the side-coupled dot departs from the energy zero point. However, the linear conductance is always analogous to the MBS-absent case once the inter-MBS coupling comes into play. These findings provide new information about the leakage effect of MBSs in quantum-dot structures.

Majorana fermions induced fast- and slow-light in a hybrid semiconducting nanowire/superconductor device

“…Majorana fermions (MFs) have witnessed significant progress over the past decade in solid state systems for their potential applications in topological quantum computation and quantum information processing [1][2][3][4][5][6][7] due to the fact that they obey non-Abelian statistics. Although MFs were proposed originally as a model for neutrinos, the analogous Majorana zero modes have been observed in condensed matter systems, [8] such as hybrid semiconducting nanowire/superconductor (SNW/SC) structures, [9][10][11][12] ferromagnetic atomic chains on a superconductor, [13] ironbased superconductor device, [14] topological superconductor devices, [15,16] and topological insulator structure.…”