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Majorana fermions in topological-insulator nanowires : From single superconducting nanowires to Josephson junctions

Huang, Guang Yao and Xu, H. Q. LU (2017) In Physical Review B - Condensed Matter and Materials Physics 95(15).
Abstract

Signatures of Majorana-fermion bound states in one-dimensional topological-insulator (TI) nanowires with proximity-effect-induced superconductivity are studied. The phase diagram and energy spectra are calculated for single-TI nanowires, and it is shown that the nanowires can be in the topologically invariant phases of winding numbers W=0,±1, and ±2, corresponding to the cases with zero, one, and two pairs of Majorana fermions in the single-TI nanowires. It is also shown that the topological winding numbers, i.e., the numbers of pairs of Majorana fermions in the TI nanowires, can be extracted from the transport measurements of a Josephson-junction device made from two TI nanowires, while the sign in the winding numbers can be extracted... (More)

Signatures of Majorana-fermion bound states in one-dimensional topological-insulator (TI) nanowires with proximity-effect-induced superconductivity are studied. The phase diagram and energy spectra are calculated for single-TI nanowires, and it is shown that the nanowires can be in the topologically invariant phases of winding numbers W=0,±1, and ±2, corresponding to the cases with zero, one, and two pairs of Majorana fermions in the single-TI nanowires. It is also shown that the topological winding numbers, i.e., the numbers of pairs of Majorana fermions in the TI nanowires, can be extracted from the transport measurements of a Josephson-junction device made from two TI nanowires, while the sign in the winding numbers can be extracted using a superconducting quantum interference device setup.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B - Condensed Matter and Materials Physics
volume
95
issue
15
publisher
American Physical Society
external identifiers
  • scopus:85017641732
  • wos:000401764100003
ISSN
1098-0121
DOI
10.1103/PhysRevB.95.155420
language
English
LU publication?
yes
id
3f1efdf5-f3e0-4f60-882c-ec1a87dc7a95
date added to LUP
2017-05-08 11:58:36
date last changed
2017-09-18 11:35:20
@article{3f1efdf5-f3e0-4f60-882c-ec1a87dc7a95,
  abstract     = {<p>Signatures of Majorana-fermion bound states in one-dimensional topological-insulator (TI) nanowires with proximity-effect-induced superconductivity are studied. The phase diagram and energy spectra are calculated for single-TI nanowires, and it is shown that the nanowires can be in the topologically invariant phases of winding numbers W=0,±1, and ±2, corresponding to the cases with zero, one, and two pairs of Majorana fermions in the single-TI nanowires. It is also shown that the topological winding numbers, i.e., the numbers of pairs of Majorana fermions in the TI nanowires, can be extracted from the transport measurements of a Josephson-junction device made from two TI nanowires, while the sign in the winding numbers can be extracted using a superconducting quantum interference device setup.</p>},
  articleno    = {155420},
  author       = {Huang, Guang Yao and Xu, H. Q.},
  issn         = {1098-0121},
  language     = {eng},
  month        = {04},
  number       = {15},
  publisher    = {American Physical Society},
  series       = {Physical Review B - Condensed Matter and Materials Physics},
  title        = {Majorana fermions in topological-insulator nanowires : From single superconducting nanowires to Josephson junctions},
  url          = {http://dx.doi.org/10.1103/PhysRevB.95.155420},
  volume       = {95},
  year         = {2017},
}