Electrically tunable chiral Majorana edge modes in quantum anomalous Hall insulator-topological superconductor systems

Abstract

Chiral Majorana edge modes are theoretically proposed to perform braiding operations for the potential quantum computation. Here, we suggest a scheme to regulate trajectories of the chiral Majorana fermion based on a quantum anomalous Hall insulator (QAHI)-topological superconductor heterostructure. An applied external gate voltage to the QAHI region introduces a dynamical phase so that the outgoing Majorana fermions can be prominently tuned to different leads. The trajectory is mechanically analyzed and the electrical manipulation is represented by the oscillating transmission coefficients versus the gate voltage. Through the optimization of devices, the conductance is likewise detectable to be periodically oscillating, which means an experimental control of chiral Majorana edge modes. Besides, this oscillating period which is robust against disorder also provides an attainable method of observing the energy dispersion relation of the edge mode of the QAHI. Furthermore, the oscillating behavior of conductance serves as smoking-gun evidence of the existence of the chiral Majorana fermion, which could be experimentally confirmed.

arXiv comment14 pages, 11 figures

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• Quarter-quantized thermal Hall effect with parity anomaly
• Spin phase regulated spin Josephson supercurrent in topological superconductor
• Electrostatic effects of the MnBi2Te4-superconductor hetero-structures in chiral Majorana search
• Realization of the Non-endpoint Majorana Bound States in an Extended Kitaev Chain
• Tunable Majorana corner states driven by superconducting phase bias in a vertical Josephson junction
• Phase transitions in quantum dot-Majorana zero mode coupling systems
• Robust quantized thermal conductance of Majorana floating edge bands in d-wave superconductors