Observation of half-integer Shapiro steps in graphene Josephson junctions
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 26, 2023
- Source ID
- 10.1063/5.0153646
Entities
People
- Bassel Heiba Elfeky
- Davood Shahrjerdi
- Javad Shabani
- Kenji Watanabe
- Takashi Taniguchi
- Zhujun Huang
Organizations
- International Center for Materials Nanoarchitectonics
- Ministry of Education, Culture, Sports, Science and Technology
- National Science Foundation
- New York University
- United States Department of Energy