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arXiv · 2510.07826

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

Sirui Yu·Junrong Wang·Huajin Zhao·Hong Mao·Jinshuang Jin
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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 ($F\gg1$) 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.

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Sirui Yu, Junrong Wang, Huajin Zhao, Hong Mao, Jinshuang Jin. 2025-10-09. Phase-controlled quantum transport signatures in a quantum dot-Majorana hybrid ring system. https://doi.org/10.1063/5.0289344

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