Ricco L S, Sanches J E, Marques Y, de Souza M, Figueira M S, Shelykh I A, Seridonio A C
Science Institute, University of Iceland, Dunhagi-3, 107, Reykjavik, Iceland.
School of Engineering, Department of Physics and Chemistry, São Paulo State University (Unesp), 15385-000, Ilha Solteira, SP, Brazil.
Sci Rep. 2021 Aug 27;11(1):17310. doi: 10.1038/s41598-021-96415-3.
We consider transport properties of a hybrid device composed by a quantum dot placed between normal and superconducting reservoirs, and coupled to a Majorana nanowire: a topological superconducting segment hosting Majorana bound states (MBSs) at the opposite ends. It is demonstrated that if highly nonlocal and nonoverlapping MBSs are formed in the system, the zero-bias Andreev conductance through the dot exhibits characteristic isoconductance profiles with the shape depending on the spin asymmetry of the coupling between the dot and the topological superconductor. Otherwise, for overlapping MBSs with less degree of nonlocality, the conductance is insensitive to the spin polarization and the isoconductance signatures disappear. This allows to propose an alternative experimental protocol for probing the nonlocality of the MBSs in Majorana nanowires.
我们考虑一种混合器件的输运性质，该器件由置于正常和超导库之间并耦合到一根马约拉纳纳米线的量子点组成：这是一个拓扑超导段，在其相对两端存在马约拉纳束缚态（MBSs）。结果表明，如果在系统中形成高度非局域且不重叠的MBSs，通过量子点的零偏置安德列夫电导会呈现出特征等电导曲线，其形状取决于量子点与拓扑超导体之间耦合的自旋不对称性。否则，对于重叠且非局域程度较低的MBSs，电导对自旋极化不敏感，等电导特征消失。这使得我们能够提出一种用于探测马约拉纳纳米线中MBSs非局域性的替代实验方案。
