Observation of half-integer Shapiro steps in graphene Josephson junctions

Huang, Zhujun; Elfeky, Bassel Heiba; Taniguchi, Takashi; Watanabe, Kenji; Shabani, Javad; Shahrjerdi, Davood

doi:10.1063/5.0153646

Observation of half-integer Shapiro steps in graphene Josephson junctions

Journal Article · Mon Jun 26 00:00:00 EDT 2023 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0153646· OSTI ID:1998861

Huang, Zhujun ^[1]; Elfeky, Bassel Heiba ^[2]; ^[3]; ^[3]; Shabani, Javad ^[2]; ^[4]

New York University, Brooklyn, NY (United States); New York University
New York University, NY (United States)
National Institute of Materials Science, Ibaraki (Japan)
New York University, Brooklyn, NY (United States)

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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: College of William and Mary, Williamsburg, VA (United States); Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: Army Research Office (ARO); JSPS KAKENHI; Japanese Ministry of Education, Science Sports and Culture (MEXT); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0022245

OSTI ID:: 1998861

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 122; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Figure 1(p. 10)

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Figure 3(p. 12)

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electronic circuits
Electronic transport
Graphene
Josephson effect
Superconducting devices

Observation of half-integer Shapiro steps in graphene Josephson junctions

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References (33)

Figures / Tables (3)

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