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Cooper-pair splitting in two parallel InAs nanowires

Baba, S. ; Jünger, C. ; Matsuo, S. ; Baumgartner, A. ; Sato, Y. ; Kamata, H. ; Li, K. ; Jeppesen, S. LU ; Samuelson, L. LU and Xu, H. Q. LU , et al. (2018) In New Journal of Physics 20(6).
Abstract

We report on the fabrication and electrical characterization of an InAs double-nanowire (NW) device consisting of two closely placed parallel NWs coupled to a common superconducting electrode on one side and individual normal metal leads on the other. In this new type of device we detect Cooper-pair splitting (CPS) with a sizeable efficiency of correlated currents in both NWs. In contrast to earlier experiments, where CPS was realized in a single NW, demonstrating an intrawire electron pairing mediated by the superconductor (SC), our experiment demonstrates an interwire interaction mediated by the common SC. The latter is the key for the realization of zero-magnetic field Majorana bound states, or Parafermions; in NWs and therefore... (More)

We report on the fabrication and electrical characterization of an InAs double-nanowire (NW) device consisting of two closely placed parallel NWs coupled to a common superconducting electrode on one side and individual normal metal leads on the other. In this new type of device we detect Cooper-pair splitting (CPS) with a sizeable efficiency of correlated currents in both NWs. In contrast to earlier experiments, where CPS was realized in a single NW, demonstrating an intrawire electron pairing mediated by the superconductor (SC), our experiment demonstrates an interwire interaction mediated by the common SC. The latter is the key for the realization of zero-magnetic field Majorana bound states, or Parafermions; in NWs and therefore constitutes a milestone towards topological superconductivity. In addition, we observe transport resonances that occur only in the superconducting state, which we tentatively attribute to Andreev bound states and/or Yu-Shiba resonances that form in the proximitized section of one NW.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Andreev transport, Cooper-pair splitting, parafermions, parallel nanowires, semiconducting nanowire, topological superconductivity
in
New Journal of Physics
volume
20
issue
6
article number
063021
publisher
IOP Publishing
external identifiers
  • scopus:85049409140
ISSN
1367-2630
DOI
10.1088/1367-2630/aac74e
language
English
LU publication?
yes
id
556ab5e4-ed61-4be2-8630-52e30c0891a4
date added to LUP
2018-07-16 12:28:47
date last changed
2023-10-20 07:21:44
@article{556ab5e4-ed61-4be2-8630-52e30c0891a4,
  abstract     = {{<p>We report on the fabrication and electrical characterization of an InAs double-nanowire (NW) device consisting of two closely placed parallel NWs coupled to a common superconducting electrode on one side and individual normal metal leads on the other. In this new type of device we detect Cooper-pair splitting (CPS) with a sizeable efficiency of correlated currents in both NWs. In contrast to earlier experiments, where CPS was realized in a single NW, demonstrating an intrawire electron pairing mediated by the superconductor (SC), our experiment demonstrates an interwire interaction mediated by the common SC. The latter is the key for the realization of zero-magnetic field Majorana bound states, or Parafermions; in NWs and therefore constitutes a milestone towards topological superconductivity. In addition, we observe transport resonances that occur only in the superconducting state, which we tentatively attribute to Andreev bound states and/or Yu-Shiba resonances that form in the proximitized section of one NW.</p>}},
  author       = {{Baba, S. and Jünger, C. and Matsuo, S. and Baumgartner, A. and Sato, Y. and Kamata, H. and Li, K. and Jeppesen, S. and Samuelson, L. and Xu, H. Q. and Schönenberger, C. and Tarucha, S.}},
  issn         = {{1367-2630}},
  keywords     = {{Andreev transport; Cooper-pair splitting; parafermions; parallel nanowires; semiconducting nanowire; topological superconductivity}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{6}},
  publisher    = {{IOP Publishing}},
  series       = {{New Journal of Physics}},
  title        = {{Cooper-pair splitting in two parallel InAs nanowires}},
  url          = {{http://dx.doi.org/10.1088/1367-2630/aac74e}},
  doi          = {{10.1088/1367-2630/aac74e}},
  volume       = {{20}},
  year         = {{2018}},
}