Realizing Majorana Kramers pairs in two-channel InAs-Al nanowires with highly misaligned electric fields

Abstract

Common proposals for realizing topological superconductivity and Majorana zero modes in semiconductor-superconductor hybrids require large magnetic fields, which paradoxically suppress the superconducting gap of the parent superconductor. Although two-channel schemes have been proposed as a way to eliminate magnetic fields, geometric constraints make their implementation challenging, since the channels should be immersed in nearly antiparallel electric fields. Here, we propose an experimentally favorable scheme for realizing field-free topological superconductivity, in two-channel InAs-Al nanowires, that overcomes such growth constraints. Crucially, we show that antiparallel fields are not required, if the channels are energetically detuned. We compute topological phase diagrams for realistically modeled nanowires, finding a broad range of parameters that could potentially harbor Majorana zero modes. This work, therefore, solves a major technical challenge and opens the door to near-term experiments.

10 pages, 8 figures

References in corpus (11)

• Non-Abelian Anyons and Topological Quantum Computation
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Epitaxy of Semiconductor-Superconductor nanowires
• Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions
• InAs-Al Hybrid Devices Passing the Topological Gap Protocol
• In search of Majorana
• Majorana Kramers pairs in Rashba double nanowires with interactions and disorder
• Partially-separated Majorana modes in a disordered medium
• Subband occupation in semiconductor-superconductor nanowires