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Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device.

Deng, Mingtang LU ; Yu, Chunlin LU ; Huang, Guangyao LU ; Larsson, Marcus LU ; Caroff, Philippe LU and Xu, Hongqi LU (2014) In Scientific Reports 4.
Abstract
We explore the signatures of Majorana fermions in a nanowire based topological superconductor-quantum dot-topological superconductor hybrid device by charge transport measurements. At zero magnetic field, well-defined Coulomb diamonds and the Kondo effect are observed. Under the application of a finite, sufficiently strong magnetic field, a zero-bias conductance peak structure is observed. It is found that the zero-bias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the even-odd parity of the quasi-particle occupation number in the quantum dot. In addition, we find that the zero-bias conductance peak is in most cases accompanied by two differential conductance peaks, forming a triple-peak structure, and... (More)
We explore the signatures of Majorana fermions in a nanowire based topological superconductor-quantum dot-topological superconductor hybrid device by charge transport measurements. At zero magnetic field, well-defined Coulomb diamonds and the Kondo effect are observed. Under the application of a finite, sufficiently strong magnetic field, a zero-bias conductance peak structure is observed. It is found that the zero-bias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the even-odd parity of the quasi-particle occupation number in the quantum dot. In addition, we find that the zero-bias conductance peak is in most cases accompanied by two differential conductance peaks, forming a triple-peak structure, and the separation between the two side peaks in bias voltage shows oscillations closely correlated to the background Coulomb conductance oscillations of the device. The observed zero-bias conductance peak and the associated triple-peak structure are in line with Majorana fermion physics in such a hybrid topological system. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
4
publisher
Nature Publishing Group
external identifiers
  • pmid:25434375
  • wos:000346257700009
  • scopus:84916214534
ISSN
2045-2322
DOI
10.1038/srep07261
language
English
LU publication?
yes
id
fbfbbb5a-b683-408d-922e-31dfc4bd10ab (old id 4913706)
date added to LUP
2015-01-13 00:30:36
date last changed
2017-11-19 03:46:12
@article{fbfbbb5a-b683-408d-922e-31dfc4bd10ab,
  abstract     = {We explore the signatures of Majorana fermions in a nanowire based topological superconductor-quantum dot-topological superconductor hybrid device by charge transport measurements. At zero magnetic field, well-defined Coulomb diamonds and the Kondo effect are observed. Under the application of a finite, sufficiently strong magnetic field, a zero-bias conductance peak structure is observed. It is found that the zero-bias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the even-odd parity of the quasi-particle occupation number in the quantum dot. In addition, we find that the zero-bias conductance peak is in most cases accompanied by two differential conductance peaks, forming a triple-peak structure, and the separation between the two side peaks in bias voltage shows oscillations closely correlated to the background Coulomb conductance oscillations of the device. The observed zero-bias conductance peak and the associated triple-peak structure are in line with Majorana fermion physics in such a hybrid topological system.},
  articleno    = {7261},
  author       = {Deng, Mingtang and Yu, Chunlin and Huang, Guangyao and Larsson, Marcus and Caroff, Philippe and Xu, Hongqi},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device.},
  url          = {http://dx.doi.org/10.1038/srep07261},
  volume       = {4},
  year         = {2014},
}