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0-π phase transition in hybrid superconductor-InSb nanowire quantum dot devices

Li, Sen; Kang, N.; Caroff, P. LU and Xu, H. Q. LU (2017) In Physical Review B 95(1).
Abstract

Hybrid superconductor-semiconducting nanowire devices provide an ideal platform to investigating interesting intragap bound states, such as the Andreev bound states (ABSs), Yu-Shiba-Rusinov (YSR) states, and the Majorana bound states. The competition between Kondo correlations and superconductivity in Josephson quantum dot (QD) devices results in two different ground states and the occurrence of a 0-π quantum phase transition. Here we report on transport measurements on hybrid superconductor-InSb nanowire QD devices with different device geometries. We demonstrate a realization of continuous gate-tunable ABSs with both 0-type levels and π-type levels. This allow us to manipulate the transition between the 0 and π junction and explore... (More)

Hybrid superconductor-semiconducting nanowire devices provide an ideal platform to investigating interesting intragap bound states, such as the Andreev bound states (ABSs), Yu-Shiba-Rusinov (YSR) states, and the Majorana bound states. The competition between Kondo correlations and superconductivity in Josephson quantum dot (QD) devices results in two different ground states and the occurrence of a 0-π quantum phase transition. Here we report on transport measurements on hybrid superconductor-InSb nanowire QD devices with different device geometries. We demonstrate a realization of continuous gate-tunable ABSs with both 0-type levels and π-type levels. This allow us to manipulate the transition between the 0 and π junction and explore charge transport and spectrum in the vicinity of the quantum phase transition regime. Furthermore, we find a coexistence of 0-type ABS and π-type ABS in the same charge state. By measuring temperature and magnetic field evolution of the ABSs, the different natures of the two sets of ABSs are verified, being consistent with the scenario of phase transition between the singlet and doublet ground state. Our study provides insight into Andreev transport properties of hybrid superconductor-QD devices and sheds light on the crossover behavior of the subgap spectrum in the vicinity of the 0-π transition.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
95
issue
1
publisher
American Physical Society
external identifiers
  • scopus:85010332642
  • wos:000392277400003
ISSN
1098-0121
DOI
10.1103/PhysRevB.95.014515
language
English
LU publication?
yes
id
30dfa8c6-1a6b-45a0-81c9-be6a2a2e28e7
date added to LUP
2017-02-15 08:51:55
date last changed
2018-01-07 11:49:57
@article{30dfa8c6-1a6b-45a0-81c9-be6a2a2e28e7,
  abstract     = {<p>Hybrid superconductor-semiconducting nanowire devices provide an ideal platform to investigating interesting intragap bound states, such as the Andreev bound states (ABSs), Yu-Shiba-Rusinov (YSR) states, and the Majorana bound states. The competition between Kondo correlations and superconductivity in Josephson quantum dot (QD) devices results in two different ground states and the occurrence of a 0-π quantum phase transition. Here we report on transport measurements on hybrid superconductor-InSb nanowire QD devices with different device geometries. We demonstrate a realization of continuous gate-tunable ABSs with both 0-type levels and π-type levels. This allow us to manipulate the transition between the 0 and π junction and explore charge transport and spectrum in the vicinity of the quantum phase transition regime. Furthermore, we find a coexistence of 0-type ABS and π-type ABS in the same charge state. By measuring temperature and magnetic field evolution of the ABSs, the different natures of the two sets of ABSs are verified, being consistent with the scenario of phase transition between the singlet and doublet ground state. Our study provides insight into Andreev transport properties of hybrid superconductor-QD devices and sheds light on the crossover behavior of the subgap spectrum in the vicinity of the 0-π transition.</p>},
  articleno    = {014515},
  author       = {Li, Sen and Kang, N. and Caroff, P. and Xu, H. Q.},
  issn         = {1098-0121},
  language     = {eng},
  month        = {01},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {0-π phase transition in hybrid superconductor-InSb nanowire quantum dot devices},
  url          = {http://dx.doi.org/10.1103/PhysRevB.95.014515},
  volume       = {95},
  year         = {2017},
}