Distinguishing Majorana bound states from localized Andreev bound states by interferometry

Article

关键词: SEMICONDUCTOR-SUPERCONDUCTOR NANOWIRES;    QUANTUM COMPUTATION;    FERMIONS;    JUNCTIONS;    SIGNATURE;    EPITAXY;    DEVICES;    GAP;   

DOI  :  10.1103/PhysRevB.97.161401

来源: SCIE

【 摘 要 】

Experimental evidence for Majorana bound states (MBSs) is so farmainly based on the robustness of a zero-bias conductance peak. However, similar features can also arise due to Andreev bound states (ABSs) localized at the end of an island. We show that these two scenarios can be distinguished by an interferometry experiment based on embedding a Coulomb-blockaded island into an Aharonov-Bohm ring. For two ABSs, when the ground state is nearly degenerate, cotunneling can change the state of the island, and interference is suppressed. By contrast, for two MBSs the ground state is nondegenerate, and cotunneling has to preserve the island state, which leads to h/e-periodic conductance oscillations with magnetic flux. Such interference setups can be realized with semiconducting nanowires or two-dimensional electron gases with proximity-induced superconductivity and may also be a useful spectroscopic tool for parity-flip mechanisms.

【 授权许可】

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