Resonant Andreev reflection in a normal-metal/quantum-dot/superconductor system with coupled Majorana bound states |
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| Affiliation: | 1. College of Physical Science and Information Engineering and Hebei Advanced Thin Film Laboratory, Hebei Normal University, Shijiazhuang 050024, China;
2. Department of Physics, Hebei Normal University for Nationalities, Chengde 067000, China;
3. Physics Department, Shijiazhuang University, Shijiazhuang 050035, China |
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| Abstract: | Andreev reflection (AR) in a normal-metal/quantum-dot/superconductor (N-QD-S) system with coupled Majorana bound states (MBSs) is investigated theoretically. We find that in the N-QD-S system, the AR can be enhanced when coupling to the MBSs is incorporated. Fano line-shapes can be observed in the AR conductance spectrum when there is an appropriate QD-MBS coupling or MBS-MBS coupling. The AR conductance is always e2/2h at the zero Fermi energy point when only QD-MBSs coupling is considered. In addition, the resonant AR occurs when the MBS-MBS coupling roughly equals to the QD energy level. We also find that an AR antiresonance appears when the QD energy level approximately equals to the sum of the QD-MBS coupling and the MBS-MBS coupling. These features may serve as characteristic signatures for the probe of MBSs. |
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| Keywords: | Majorana bound states Andreev reflection Fano effect quantum dot |
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