Two-Dimensional Platform for Networks of Majorana Bound States
(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.
(Less)
- author
- Hell, Michael LU ; Leijnse, Martin LU and Flensberg, Karsten
- organization
- publishing date
- 2017-03-10
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 118
- issue
- 10
- article number
- 107701
- publisher
- American Physical Society
- external identifiers
-
- pmid:28339276
- wos:000396047700013
- scopus:85014883039
- 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
- 2024-06-24 18:05:31
@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>}},
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}},
doi = {{10.1103/PhysRevLett.118.107701}},
volume = {{118}},
year = {{2017}},
}