Spin Transport in Ferromagnet-InSb Nanowire Quantum Devices
Abstract
Signatures of Majorana zero modes (MZMs), which are the building blocks for fault-tolerant topological quantum computing, have been observed in semiconductor nanowires (NW) with strong spin-orbital-interaction (SOI), such as InSb and InAs NWs with proximity-induced superconductivity. Realizing topological superconductivity and MZMs in this most widely-studied platform also requires eliminating spin degeneracy, which is realized by applying a magnetic field to induce a helical gap. Yet, the applied field can adversely impact the induced superconducting state in the NWs and also places geometric restrictions on the device, which can affect scaling of future MZM-based quantum registers. These challenges could be circumvented by integrating magnetic elements with the NWs. With this motivation, in this work we report the first experimental investigation of spin transport across InSb NWs, which are enabled by devices with ferromagnetic (FM) contacts. We determine signatures of spin polarization and spin-dependent transport in the quasi-one-dimensional ballistic regime. Moreover, we show that electrostatic gating tunes the observed magnetic signal and also reveals a transport regime where the device acts as a spin filter. These results open an avenue towards developing MZM devices in which spin degeneracy is lifted locally, without the need of an applied magnetic field. They further providemore »
- Authors:
-
- Univ. of Minnesota, Minneapolis, MN (United States)
- Eindhoven Univ. of Technology (Netherlands)
- Publication Date:
- Research Org.:
- Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; European Research Council (ERC); National Science Foundation (NSF)
- OSTI Identifier:
- 1618853
- Grant/Contract Number:
- SC0019274; ECCS-1542202
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 20; Journal Issue: 5; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; InSb nanowire; semiconductor-ferromagnet quantum device; 1D ballistic spin transport; helical gap
Citation Formats
Yang, Zedong, Heischmidt, Brett, Gazibegovic, Sasa, Badawy, Ghada, Car, Diana, Crowell, Paul A., Bakkers, Erik P. A. M., and Pribiag, Vlad S. Spin Transport in Ferromagnet-InSb Nanowire Quantum Devices. United States: N. p., 2020.
Web. doi:10.1021/acs.nanolett.9b05331.
Yang, Zedong, Heischmidt, Brett, Gazibegovic, Sasa, Badawy, Ghada, Car, Diana, Crowell, Paul A., Bakkers, Erik P. A. M., & Pribiag, Vlad S. Spin Transport in Ferromagnet-InSb Nanowire Quantum Devices. United States. https://doi.org/10.1021/acs.nanolett.9b05331
Yang, Zedong, Heischmidt, Brett, Gazibegovic, Sasa, Badawy, Ghada, Car, Diana, Crowell, Paul A., Bakkers, Erik P. A. M., and Pribiag, Vlad S. Mon .
"Spin Transport in Ferromagnet-InSb Nanowire Quantum Devices". United States. https://doi.org/10.1021/acs.nanolett.9b05331. https://www.osti.gov/servlets/purl/1618853.
@article{osti_1618853,
title = {Spin Transport in Ferromagnet-InSb Nanowire Quantum Devices},
author = {Yang, Zedong and Heischmidt, Brett and Gazibegovic, Sasa and Badawy, Ghada and Car, Diana and Crowell, Paul A. and Bakkers, Erik P. A. M. and Pribiag, Vlad S.},
abstractNote = {Signatures of Majorana zero modes (MZMs), which are the building blocks for fault-tolerant topological quantum computing, have been observed in semiconductor nanowires (NW) with strong spin-orbital-interaction (SOI), such as InSb and InAs NWs with proximity-induced superconductivity. Realizing topological superconductivity and MZMs in this most widely-studied platform also requires eliminating spin degeneracy, which is realized by applying a magnetic field to induce a helical gap. Yet, the applied field can adversely impact the induced superconducting state in the NWs and also places geometric restrictions on the device, which can affect scaling of future MZM-based quantum registers. These challenges could be circumvented by integrating magnetic elements with the NWs. With this motivation, in this work we report the first experimental investigation of spin transport across InSb NWs, which are enabled by devices with ferromagnetic (FM) contacts. We determine signatures of spin polarization and spin-dependent transport in the quasi-one-dimensional ballistic regime. Moreover, we show that electrostatic gating tunes the observed magnetic signal and also reveals a transport regime where the device acts as a spin filter. These results open an avenue towards developing MZM devices in which spin degeneracy is lifted locally, without the need of an applied magnetic field. They further provide a path for realizing spin-based devices that leverage spin-orbital states in quantum wires.},
doi = {10.1021/acs.nanolett.9b05331},
journal = {Nano Letters},
number = 5,
volume = 20,
place = {United States},
year = {Mon Apr 27 00:00:00 EDT 2020},
month = {Mon Apr 27 00:00:00 EDT 2020}
}
Web of Science
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