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Phase-controlled quantum transport signatures in a quantum dot-Majorana hybrid ring system
Sirui Yu1, Junrong Wang1, Huajin Zhao1
1School of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China.
The Journal of Chemical Physics
|October 8, 2025
Summary
We studied quantum transport in a hybrid ring system. A giant Fano factor, indicating Majorana bound states (MBSs), was observed, offering a new detection signature.
Area of Science:
- Quantum physics
- Condensed matter physics
- Mesoscopic systems
Background:
- Hybrid quantum systems offer unique platforms for exploring exotic quantum phenomena.
- Majorana bound states (MBSs) are exotic quasiparticles with potential applications in topological quantum computing.
- Understanding quantum transport in such systems is crucial for their technological development.
Purpose of the Study:
- To investigate quantum transport properties of a hybrid ring system.
- To explore the role of quantum dots (QDs) and Majorana bound states (MBSs) in determining transport characteristics.
- To identify potential signatures for MBS detection.
Main Methods:
- Utilized the dissipaton equation-of-motion approach to model quantum transport.
- Analyzed differential conductance and shot noise measurements.
- Investigated the influence of magnetic flux, QD energy level, and MBS overlap.
Main Results:
- Observed periodic behavior in differential conductance, dependent on QD energy and MBS overlap.
- Identified a zero-bias peak (ZBP) as a signature of single MBS presence.
- Discovered voltage-dependent transitions in shot noise regimes (sub-Poissonian, Poissonian, super-Poissonian).
- Reported a giant Fano factor (F ≫ 1) at the balance point, indicating a novel MBS detection signature.
Conclusions:
- The hybrid ring system exhibits distinct quantum transport phenomena.
- The giant Fano factor serves as a supplementary signature for MBS detection.
- Thermal effects can degrade both the ZBP and the shot noise peak, highlighting the need for low-temperature experiments.
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