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arxiv 1904.06275 v2 pith:VNVECRYM submitted 2019-04-12 cond-mat.mes-hall quant-ph

Optimized micromagnet geometries for Majorana zero modes in low g-factor materials

classification cond-mat.mes-hall quant-ph
keywords majoranamaterialsspin-orbitboundcouplingg-factorgeometriesintrinsic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Solid-state experimental realizations of Majorana bound states are based on materials with strong intrinsic spin-orbit interactions. In this paper, we explore an alternative approach where spin-orbit coupling is induced artificially through a nonuniform magnetic field that originates from an array of micromagnets. Using a recently developed optimization algorithm, we find suitable magnet geometries for the emergence of topological superconductivity in wires without intrinsic spin-orbit coupling. We confirm the robustness of Majorana bound states against disorder and periodic potentials whose amplitudes do not exceed the Zeeman energy. Furthermore, we identify low g-factor materials commonly used in mesoscopic physics experiments as viable candidates for Majorana devices.

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