New signatures of the spin gap in quantum point contacts

Author:

Hudson K. L.ORCID,Srinivasan A.,Goulko O.ORCID,Adam J.,Wang Q.ORCID,Yeoh L. A.,Klochan O.,Farrer I.ORCID,Ritchie D. A.ORCID,Ludwig A.ORCID,Wieck A. D.ORCID,von Delft J.ORCID,Hamilton A. R.ORCID

Abstract

AbstractOne dimensional semiconductor systems with strong spin-orbit interaction are both of fundamental interest and have potential applications to topological quantum computing. Applying a magnetic field can open a spin gap, a pre-requisite for Majorana zero modes. The spin gap is predicted to manifest as a field dependent dip on the first 1D conductance plateau. However, disorder and interaction effects make identifying spin gap signatures challenging. Here we study experimentally and numerically the 1D channel in a series of low disorder p-type GaAs quantum point contacts, where spin-orbit and hole-hole interactions are strong. We demonstrate an alternative signature for probing spin gaps, which is insensitive to disorder, based on the linear and non-linear response to the orientation of the applied magnetic field, and extract a spin-orbit gap ΔE ≈ 500 μeV. This approach could enable one-dimensional hole systems to be developed as a scalable and reproducible platform for topological quantum applications.

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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