Observation of half-integer Shapiro steps in graphene Josephson junctions-Reference-Cited by-同舟云学术

Observation of half-integer Shapiro steps in graphene Josephson junctions

Published:2023-06-26 Issue:26 Volume:122 Page:
ISSN:0003-6951
Container-title:Applied Physics Letters
language:en
Short-container-title:

Author:

Huang Zhujun¹,Elfeky Bassel Heiba²,Taniguchi Takashi³^ORCID,Watanabe Kenji⁴^ORCID,Shabani Javad²,Shahrjerdi Davood¹^ORCID

Affiliation:

1. Electrical and Computer Engineering, New York University 1 , Brooklyn, New York 11201, USA

2. Center for Quantum Information Physics, Department of Physics, New York University 2 , New York 10003, USA

3. International Center for Materials Nanoarchitectonics, National Institute of Materials Science 3 , 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

4. Research Center for Functional Materials, National Institute of Materials Science 4 , 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan

Abstract

We study quantum transport and AC Josephson effect of hexagonal boron nitride encapsulated graphene (BGB) Josephson junctions (JJs). Our experiments reveal the emergence of the half-integer Shapiro steps in the n-type regime with high electron carrier densities. We attribute this observation to the gate-tunable transmission probability of the graphene junction. Our numerical simulations are consistent with the appearance of half-integer Shapiro steps at high transparency, which suggests a skewed current phase relationship in the graphene JJ.

Funder

NSF

ARO

DOE

MEXT

JSPS KAKENHI

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

Link

https://pubs.aip.org/aip/apl/article-pdf/doi/10.1063/5.0153646/18017835/262601_1_5.0153646.pdf