New signatures of the spin gap in quantum point contacts
Authors
Srinivasan, A.
Adam, J.
Yeoh, L. A.
Klochan, O.
Publication Date
2021-01-04Journal Title
Nature Communications
Publisher
Nature Publishing Group UK
Volume
12
Issue
1
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Hudson, K. L., Srinivasan, A., Goulko, O., Adam, J., Wang, Q., Yeoh, L. A., Klochan, O., et al. (2021). New signatures of the spin gap in quantum point contacts. Nature Communications, 12 (1)https://doi.org/10.1038/s41467-020-19895-3
Abstract
Abstract: One 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.
Keywords
Article, /639/766/119/1000/1016, /639/766/119/1001, /639/766/483, /120, article
Identifiers
s41467-020-19895-3, 19895
External DOI: https://doi.org/10.1038/s41467-020-19895-3
This record's URL: https://www.repository.cam.ac.uk/handle/1810/315659
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/