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Title: Designing Nanomagnet Arrays for Topological Nanowires in Silicon

Abstract

Recent interest in topological quantum computing has driven research into topological nanowires, one-dimensional quantum wires that support topological modes, including Majorana fermions. Most topological nanowire designs rely on materials with strong spin-orbit coupling, such as InAs or InSb, used in combination with superconductors. It would be advantageous to fabricate topological nanowires with Si owing to its mature technology. However, the intrinsic spin-orbit coupling in Si is weak. One approach that could circumvent this material deficiency is to rotate the electron spins with nanomagnets. Here we perform detailed simulations of realistic Si/SiGe systems with an artificial spin-orbit gap induced by a nanomagnet array. Most of our results are generalizable to other nanomagnet-based topological nanowire designs. By studying several concrete examples, we gain insight into the effects of nanomagnet arrays, leading to design rules and guidelines. In particular, we develop a recipe for eliminating unwanted gaps that result from realistic nanomagnet designs. Lastly, we present an experimentally realizable design using magnets with a single polarization.

Authors:
 [1];  [2];  [1];  [3];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Microsoft Research, Redmond, WA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1492365
Report Number(s):
SAND-2018-13867J
Journal ID: ISSN 2331-7019; PRAHB2; 670714
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 10; Journal Issue: 5; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Maurer, Leon N., Gamble, John K., Tracy, Lisa A., Eley, Serena, and Lu, Tzu -Ming. Designing Nanomagnet Arrays for Topological Nanowires in Silicon. United States: N. p., 2018. Web. doi:10.1103/PhysRevApplied.10.054071.
Maurer, Leon N., Gamble, John K., Tracy, Lisa A., Eley, Serena, & Lu, Tzu -Ming. Designing Nanomagnet Arrays for Topological Nanowires in Silicon. United States. doi:10.1103/PhysRevApplied.10.054071.
Maurer, Leon N., Gamble, John K., Tracy, Lisa A., Eley, Serena, and Lu, Tzu -Ming. Fri . "Designing Nanomagnet Arrays for Topological Nanowires in Silicon". United States. doi:10.1103/PhysRevApplied.10.054071.
@article{osti_1492365,
title = {Designing Nanomagnet Arrays for Topological Nanowires in Silicon},
author = {Maurer, Leon N. and Gamble, John K. and Tracy, Lisa A. and Eley, Serena and Lu, Tzu -Ming},
abstractNote = {Recent interest in topological quantum computing has driven research into topological nanowires, one-dimensional quantum wires that support topological modes, including Majorana fermions. Most topological nanowire designs rely on materials with strong spin-orbit coupling, such as InAs or InSb, used in combination with superconductors. It would be advantageous to fabricate topological nanowires with Si owing to its mature technology. However, the intrinsic spin-orbit coupling in Si is weak. One approach that could circumvent this material deficiency is to rotate the electron spins with nanomagnets. Here we perform detailed simulations of realistic Si/SiGe systems with an artificial spin-orbit gap induced by a nanomagnet array. Most of our results are generalizable to other nanomagnet-based topological nanowire designs. By studying several concrete examples, we gain insight into the effects of nanomagnet arrays, leading to design rules and guidelines. In particular, we develop a recipe for eliminating unwanted gaps that result from realistic nanomagnet designs. Lastly, we present an experimentally realizable design using magnets with a single polarization.},
doi = {10.1103/PhysRevApplied.10.054071},
journal = {Physical Review Applied},
issn = {2331-7019},
number = 5,
volume = 10,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 30, 2019
Publisher's Version of Record

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Cited by: 1 work
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