Observation of half-integer Shapiro steps in graphene Josephson junctions

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

doi:10.1063/5.0153646

Observation of half-integer Shapiro steps in graphene Josephson junctions

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

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

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.

Original language	English (US)
Article number	262601
Journal	Applied Physics Letters
Volume	122
Issue number	26
DOIs	https://doi.org/10.1063/5.0153646
State	Published - Jun 26 2023

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/5.0153646

Cite this

@article{8d64ecf0dc8647908068301ef03a74ca,

title = "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.",

author = "Zhujun Huang and Elfeky, {Bassel Heiba} and Takashi Taniguchi and Kenji Watanabe and Javad Shabani and Davood Shahrjerdi",

note = "Publisher Copyright: {\textcopyright} 2023 Author(s).",

year = "2023",

month = jun,

day = "26",

doi = "10.1063/5.0153646",

language = "English (US)",

volume = "122",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "26",

}

TY - JOUR

T1 - Observation of half-integer Shapiro steps in graphene Josephson junctions

AU - Huang, Zhujun

AU - Elfeky, Bassel Heiba

AU - Taniguchi, Takashi

AU - Watanabe, Kenji

AU - Shabani, Javad

AU - Shahrjerdi, Davood

PY - 2023/6/26

Y1 - 2023/6/26

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85163979829&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85163979829&partnerID=8YFLogxK

U2 - 10.1063/5.0153646

DO - 10.1063/5.0153646

M3 - Article

AN - SCOPUS:85163979829

SN - 0003-6951

VL - 122

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 26

M1 - 262601

ER -

Observation of half-integer Shapiro steps in graphene Josephson junctions

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this