Probing the Design Space of InSb Topological Superconductor Nanowires for the Realization of Majorana Zero Modes

Abstract

Non-Abelian anyons such as Majorana zero modes (MZMs) have the potential to enable fault-tolerant quantum computing through topological protection. Experimentally reported InSb topological superconductor nanowires (TSNW) are investigated theoretically and numerically to evaluate their suitability to host MZMs. We employ eigenspectra analysis and quantum transport based on the non-equilibrium Green's function (NEGF) formalism to investigate the eigenenergies, Majorana wave functions via local density of states, transmission spectra for Andreev processes, and zero-bias conductance peaks (ZBCPs) in InSb TSNWs. For 1.6 {\mu}m- and 2.2 {\mu}m-long InSb TSNWs we demonstrate the existence of the optimum design space defined by the applied magnetic field and electrochemical potential, which leads to clear ZBCP signatures with a Majorana localization length down to ~340 nm.