Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session R27: Thermal and Ballistic Transport in Semiconductors
8:00 AM–10:36 AM,
Thursday, March 5, 2020
Room: 404
Sponsoring
Unit:
FIAP
Chair: Benjamin Fregoso, Kent State Univ - Kent
Abstract: R27.00004 : Observation of anomalous Shapiro steps in ballistic Josephson junctions of InAs nanowires
Presenter:
Kento Ueda
(Univ of Tokyo)
Authors:
Kento Ueda
(Univ of Tokyo)
Sadashige Matsuo
(RIKEN)
Hiroshi Kamata
(Univ of Tokyo)
Yuusuke Takeshige
(Univ of Tokyo)
Yosuke Sato
(Univ of Tokyo)
Shoji Baba
(Univ of Tokyo)
Lars Samuelson
(Lund University)
Kan Li
(Peking University)
Soren Jeppesen
(Lund University)
Hongqi Xu
(Peking University)
Seigo Tarucha
(RIKEN)
For example, the quantized conductance due to Majorana Fermions (MFs) [1], and high-efficient Cooper pair splitting [2] have been observed in a superconducting junction of a single NW, and double NW, respectively.
Here we report on observation of anomalous Shapiro steps measured in Josephson junctions (JJs) of InAs NWs. The Shapiro steps appear on not only integer multiples of hf/2e but also the half-integer multiples. We attribute these anomalous steps to the skewed current-phase relation (CPR) expected in the ballistic JJs. Our results contribute to establish the relationship between the CPR and Shapiro step anomalies, which is also important for study of MFs.
[1] H. Zhang, et al., Nature 556, 74–79 (2018)
[2] K. Ueda, et al., Sci. Adv. 5, eaaw2194 (2019)
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