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

12 Apr 2019  ·  Turcotte Sara, Boutin Samuel, Lemyre Julien Camirand, Garate Ion, Pioro-Ladrière Michel ·

Solid-state experimental realizations of Majorana bound states are based on materials with strong intrinsic spin-orbit interactions. In this work, we explore an alternative approach where spin-orbit coupling is induced artificially through a non-uniform magnetic field that originates from an array of micromagnets... Using a recently developed optimization algorithm, we find suitable micromagnet geometries for the emergence of topological superconductivity in a one-dimensional wire without intrinsic spin-orbit coupling. We confirm the robustness of Majorana bound states against micromagnet nanofabrication errors, and identify low g-factor materials commonly used in mesoscopic physics experiments as viable candidates for Majorana devices. read more

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Mesoscale and Nanoscale Physics Quantum Physics