Phase-controlled quantum transport signatures in a quantum dot-Majorana hybrid ring system

Abstract

We investigate the quantum transport in a hybrid ring system consisting of a quantum dot (QD) coupled to two Majorana bound states (MBSs) hosted in a topological superconducting nanowire, threaded by a magnetic flux. Utilizing the dissipaton equation-of-motion approach, we demonstrate that the differential conductance shows periodic behavior and its periodicity depends on both the QD energy level and the MBS overlapping. A zero-bias peak (ZBP) emerges as a result of the balance between normal and anomalous tunneling processes, associated with the presence of a single MBS. Beyond the phase-dependent periodic behavior, the shot noise exhibits voltage-dependent transitions between sub-Poissonian ($F=0.5$), Poissonian ($F=1$), and super-Poissonian ($F>1$) regimes. Strikingly, we find a giant Fano factor ($F\gg 1$) emerging at the balance point, accompanied by a peak in the shot noise. This distinctive feature may serve as a supplementary signature for MBS detection. However, both ZBP in the differential conductance and shot noise peak are degraded by thermal effects.

11 pages, 4 figures

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Cited by in corpus (1)

• Fluctuation response of a minimal Kitaev chain in nonequilibrium states