Electrostatic effects of the MnBi2Te4-superconductor hetero-structures in chiral Majorana search

Abstract

The realization of chiral Majorana modes is a challenging task. We aim to comprehend the phase diagrams and parameter control capabilities of the actual devices used in the chiral Majorana search. Beyond the well-known minimal models, we develop a numerical simulation scheme using a self-consistent Schrodinger-Poisson approach to study, as an example, the MnBi2Te4 thin film coupled to an s-wave superconductor. We show that both the superconducting proximity effect and the tunability of the chemical potential for the topological surface states are significantly influenced by the gate-induced electrostatic potential. This complicates the implementation in experiments, and the actual topological region will be narrowed in stark contrast to those predicted in the previous minimal models. Nevertheless, we demonstrate that the chiral Majorana mode still exists in a wide range of experimental parameters with practical tunability.

11 pages, 9 figures

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• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Classification of topological insulators and superconductors in three spatial dimensions
• Topological Field Theory of Time-Reversal Invariant Insulators
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
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• Proximity effect at the superconductor - topological insulator interface
• Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi${}_2$Te${}_4$
• Analytical solution for the surface states of antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
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• Majorana bound states in topological insulators without a vortex
• Higher-order topological superconductors based on weak topological insulators
• Electrically tunable topological superconductivity and Majorana fermions in two dimensions
• Anomalous Floquet Chiral Topological Superconductivity in a Topological Insulator Sandwich Structure
• Electrically tunable chiral Majorana edge modes in quantum anomalous Hall insulator-topological superconductor systems
• Metallization and proximity superconductivity in topological insulator nanowires
• Direct visualization of surface spin-flip transition in MnBi4Te7
• Massive suppression of proximity pairing in topological (Bi${}_{1-x}$Sb${}_x{)}_2$Te${}_3$ films on niobium
• Formation of a stable surface oxide in MnBi${}_2$Te${}_4$ thin films

Cited by in corpus (3)

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• Laughlin charge pumping from interplay of chiral Dirac and chiral Majorana modes
• Presence versus absence of charging energies in PbTe quantum dots