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Interference effect on the Andreev reflections induced by Majorana bound states
Tong Gong1, Xue-Feng Dai1, Lian-Lian Zhang1
1College of Sciences, Northeastern University, Shenyang 110819, People's Republic of China.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 15, 2021
Summary
Quantum interference significantly influences Andreev reflections (ARs) from Majorana bound states (MBSs) when coupled via quantum dots. This effect, tunable with magnetic flux, offers new ways to control MBS properties.
Area of Science:
- Condensed Matter Physics
- Quantum Computing
- Nanotechnology
Background:
- Majorana bound states (MBSs) are exotic quasiparticles with potential applications in topological quantum computing.
- Andreev reflections (ARs) are crucial phenomena for detecting and characterizing MBSs.
- Quantum interference effects in nanoscale systems can lead to novel electronic properties.
Purpose of the Study:
- To investigate the impact of quantum interference on Andreev reflections (ARs) induced by Majorana bound states (MBSs).
- To explore how coupling MBSs via a quantum-dot molecule influences ARs.
- To understand the role of local magnetic flux in modulating these interference effects.
Main Methods:
- Theoretical modeling of a system with coupled Majorana bound states (MBSs) and a quantum-dot molecule.
- Analysis of quantum interference effects arising from direct and indirect couplings.
- Calculation of differential conductance and Fano factors as a function of system parameters.
Main Results:
- A quantum ring is effectively constructed due to the coupling of MBSs, leading to significant quantum interference in ARs.
- Differential conductance and Fano factors exhibit strong dependence on magnetic flux, dot-MBS couplings, and dot level.
- At zero bias, interference properties can efficiently tune the magnitudes and relations of Fano factors.
Conclusions:
- Quantum interference plays a critical role in manipulating Andreev reflection behaviors of MBSs.
- The proposed system provides a platform for controlling MBS properties through engineered quantum interference.
- This research highlights the importance of quantum interference for advancing MBS-based technologies.
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