Electrostatic effects of MnBi2Te4-superconductor heterostructures in the chiral Majorana search

Abstract

The realization of chiral Majorana modes using heterostructures is a challenging task. A significant reason is that the previous theoretical models are simple and cannot capture the real physics among the interplay of superconductivity, magnetism, and the electrostatic environment. Beyond the well-known minimal models, we develop a self-consistent Schrödinger-Poisson method to include a key focus—the electrostatic effects induced by the gate control. We show that the electrostatic environment imposes constraints on both induced superconductivity and the effective magnetization, and therefore significantly changes the topological region compared to previous work. However, within our theory we identify the topological regimes supporting the chiral Majorana mode with practical tunability. Importantly, the induced superconductivity in the topological regime, contrary to traditional beliefs, will not be reduced by the presence of the magnetization. Our results deeply comprehend the real phase diagrams and parameter tunability of the actual devices in a chiral Majorana search.

Source-reported materials — not catalogue approval

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