Chiral Majorana fermion modes regulated by a scanning tunneling microscope tip

Abstract

The Majorana fermion can be described by a real wave function with only two phases (0 and π) which provide a controllable degree of freedom. We propose a strategy to regulate the phase of the chiral Majorana state by coupling with a scanning tunneling microscope tip in a system consisting of quantum anomalous Hall insulator coupled with a superconductor. With the change of the chemical potential, the chiral Majorana state can be tuned alternately between 0 and π, in which, correspondingly, the perfect normal tunneling and perfect crossed Andreev reflection appear. The perfect crossed Andreev reflection, by which a Cooper pair can be split into two electrons going into different terminals completely, leads to a pumping current and distinct quantized resistances. These findings may provide a signature of Majorana fermions and pave a feasible avenue to regulate the phase of Majorana state.

9 pages, 7 figures

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Cited by in corpus (8)

• Non-Abelian Braiding of Chiral Majorana Fermions by Quantum Dots
• Photoinduced $\frac{1}{2}\frac{e^2}{h}$ and $\frac{3}{2}\frac{e^2}{h}$ conductance plateaus in topological insulator-superconductor heterostructures
• Electrically tunable chiral Majorana edge modes in quantum anomalous Hall insulator-topological superconductor systems
• Perfect crossed Andreev reflection in the proximitized graphene/superconductor/proximitized graphene junctions
• Configuration-Sensitive Transport on Domain Walls of a Magnetic Topological Insulator
• Spin-triplet superconductor$-$quantum anomalous Hall insulator$-$spin-triplet superconductor Josephson junctions: $0$-$\pi$ transition, ${\varphi }_0$ phase and switch effects
• Magnetic Flux Control of Chiral Majorana Edge Modes in Topological Superconductor
• Conductance oscillations and speed of chiral Majorana mode in a quantum-anomalous-Hall 2d strip