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Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires

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arxiv 1807.01940 v2 pith:QMBE3N6K submitted 2018-07-05 cond-mat.mes-hall

Jouri D.S. Bommer , Hao Zhang , Önder Gül , Bas Nijholt , Michael Wimmer , Filipp N. Rybakov , Julien Garaud , Donjan Rodic
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Egor Babaev Matthias Troyer Diana Car Sébastien R. Plissard Erik P.A.M. Bakkers Kenji Watanabe Takashi Taniguchi Leo P. Kouwenhoven
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keywords nanowiresspin-orbitsuperconductorcoupledfieldinducedmajoranaaffected
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abstract

Spin-orbit interaction (SOI) plays a key role in creating Majorana zero modes in semiconductor nanowires proximity coupled to a superconductor. We track the evolution of the induced superconducting gap in InSb nanowires coupled to a NbTiN superconductor in a large range of magnetic field strengths and orientations. Based on realistic simulations of our devices, we reveal SOI with a strength of 0.15-0.35 eV$\require{mediawiki-texvc}\AA$. Our approach identifies the direction of the spin-orbit field, which is strongly affected by the superconductor geometry and electrostatic gates.

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