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Two-Dimensional Platform for Networks of Majorana Bound States

Hell, Michael LU ; Leijnse, Martin LU and Flensberg, Karsten (2017) In Physical Review Letters 118(10).
Abstract

We model theoretically a two-dimensional electron gas (2DEG) covered by a superconductor and demonstrate that topological superconducting channels are formed when stripes of the superconducting layer are removed. As a consequence, Majorana bound states (MBSs) are created at the ends of the stripes. We calculate the topological invariant and energy gap of a single stripe, using realistic values for an InAs 2DEG proximitized by an epitaxial Al layer. We show that the topological gap is enhanced when the structure is made asymmetric. This can be achieved either by imposing a phase difference (by driving a supercurrent or using a magnetic-flux loop) over the strip or by replacing one superconductor by a metallic gate. Both strategies also... (More)

We model theoretically a two-dimensional electron gas (2DEG) covered by a superconductor and demonstrate that topological superconducting channels are formed when stripes of the superconducting layer are removed. As a consequence, Majorana bound states (MBSs) are created at the ends of the stripes. We calculate the topological invariant and energy gap of a single stripe, using realistic values for an InAs 2DEG proximitized by an epitaxial Al layer. We show that the topological gap is enhanced when the structure is made asymmetric. This can be achieved either by imposing a phase difference (by driving a supercurrent or using a magnetic-flux loop) over the strip or by replacing one superconductor by a metallic gate. Both strategies also enable control over the MBS splitting, thereby facilitating braiding and readout schemes based on controlled fusion of MBSs. Finally, we outline how a network of Majorana stripes can be designed.

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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 Letters
volume
118
issue
10
publisher
American Physical Society
external identifiers
  • scopus:85014883039
  • wos:000396047700013
ISSN
0031-9007
DOI
10.1103/PhysRevLett.118.107701
language
English
LU publication?
yes
id
9755b437-e500-481b-856a-27fcd9945887
date added to LUP
2017-03-23 09:28:01
date last changed
2017-09-18 11:33:55
@article{9755b437-e500-481b-856a-27fcd9945887,
  abstract     = {<p>We model theoretically a two-dimensional electron gas (2DEG) covered by a superconductor and demonstrate that topological superconducting channels are formed when stripes of the superconducting layer are removed. As a consequence, Majorana bound states (MBSs) are created at the ends of the stripes. We calculate the topological invariant and energy gap of a single stripe, using realistic values for an InAs 2DEG proximitized by an epitaxial Al layer. We show that the topological gap is enhanced when the structure is made asymmetric. This can be achieved either by imposing a phase difference (by driving a supercurrent or using a magnetic-flux loop) over the strip or by replacing one superconductor by a metallic gate. Both strategies also enable control over the MBS splitting, thereby facilitating braiding and readout schemes based on controlled fusion of MBSs. Finally, we outline how a network of Majorana stripes can be designed.</p>},
  articleno    = {107701},
  author       = {Hell, Michael and Leijnse, Martin and Flensberg, Karsten},
  issn         = {0031-9007},
  language     = {eng},
  month        = {03},
  number       = {10},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Two-Dimensional Platform for Networks of Majorana Bound States},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.118.107701},
  volume       = {118},
  year         = {2017},
}