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Evidence of half-integer Shapiro steps originated from nonsinusoidal current phase relation in a short ballistic InAs nanowire Josephson junction

Ueda, Kento ; Matsuo, Sadashige ; Kamata, Hiroshi ; Sato, Yosuke ; Takeshige, Yuusuke ; Li, Kan ; Samuelson, Lars LU ; Xu, Hongqi and Tarucha, Seigo (2020) In Physical Review Research 2(3).
Abstract

We report on half-integer Shapiro steps observed in a gate-tunable short ballistic InAs nanowire Josephson junction. We observed the Shapiro steps of the short ballistic InAs nanowire Josephson junction and found the half-integer steps in addition to the conventional integer steps. In this Josephson junction device the junction transmission can be varied with gate voltage. From measurements of the gate voltage and temperature dependences of the Shapiro steps, the origin of half-integer steps is assigned to the skewness of the current phase relation in the short ballistic Josephson junctions. These results will contribute to establish and control the superconductivity physics in the short ballistic semiconductor nanowires.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Research
volume
2
issue
3
article number
033435
publisher
American Physical Society
external identifiers
  • scopus:85107846210
ISSN
2643-1564
DOI
10.1103/PhysRevResearch.2.033435
language
English
LU publication?
yes
id
2872317a-ce4d-4f8f-b45e-6f2ce49f84b3
date added to LUP
2022-04-01 16:04:14
date last changed
2023-11-21 04:09:00
@article{2872317a-ce4d-4f8f-b45e-6f2ce49f84b3,
  abstract     = {{<p>We report on half-integer Shapiro steps observed in a gate-tunable short ballistic InAs nanowire Josephson junction. We observed the Shapiro steps of the short ballistic InAs nanowire Josephson junction and found the half-integer steps in addition to the conventional integer steps. In this Josephson junction device the junction transmission can be varied with gate voltage. From measurements of the gate voltage and temperature dependences of the Shapiro steps, the origin of half-integer steps is assigned to the skewness of the current phase relation in the short ballistic Josephson junctions. These results will contribute to establish and control the superconductivity physics in the short ballistic semiconductor nanowires.</p>}},
  author       = {{Ueda, Kento and Matsuo, Sadashige and Kamata, Hiroshi and Sato, Yosuke and Takeshige, Yuusuke and Li, Kan and Samuelson, Lars and Xu, Hongqi and Tarucha, Seigo}},
  issn         = {{2643-1564}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Research}},
  title        = {{Evidence of half-integer Shapiro steps originated from nonsinusoidal current phase relation in a short ballistic InAs nanowire Josephson junction}},
  url          = {{http://dx.doi.org/10.1103/PhysRevResearch.2.033435}},
  doi          = {{10.1103/PhysRevResearch.2.033435}},
  volume       = {{2}},
  year         = {{2020}},
}