Current-phase relation of ballistic graphene Josephson junctions

Nanda, G.; Aguilera-Servin, J. L.; Rakyta, P.; Kormányos, Andor; Kleiner, Reinhold; Kölle, Dieter; Watanabe, K.; Taniguchi, T.; Vandersypen, L. M. K.; Goswami, S.

Current-phase relation of ballistic graphene Josephson junctions

Dateien

Nanda_0-414361.pdfGröße: 2.37 MBDownloads: 252

Datum

2016

Autor:innen

Nanda, G.

Aguilera-Servin, J. L.

Rakyta, P.

Kormányos, Andor

Kleiner, Reinhold

Kölle, Dieter

Watanabe, K.

Taniguchi, T.

Vandersypen, L. M. K.

Goswami, S.

Open Access-Veröffentlichung

Open Access Hybrid

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Nano Letters. 2016, 17(6), pp. 3396-3401. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.7b00097

Zusammenfassung

The current-phase relation (CPR) of a Josephson junction (JJ) determines how the supercurrent evolves with the superconducting phase difference across the junction. Knowledge of the CPR is essential in order to understand the response of a JJ to various external parameters. Despite the rising interest in ultra-clean encapsulated graphene JJs, the CPR of such junctions remains unknown. Here, we use a fully gate-tunable graphene superconducting quantum intereference device (SQUID) to determine the CPR of ballistic graphene JJs. Each of the two JJs in the SQUID is made with graphene encapsulated in hexagonal boron nitride. By independently controlling the critical current of the JJs, we can operate the SQUID either in a symmetric or asymmetric configuration. The highly asymmetric SQUID allows us to phase-bias one of the JJs and thereby directly obtain its CPR. The CPR is found to be skewed, deviating significantly from a sinusoidal form. The skewness can be tuned with the gate voltage and oscillates in anti-phase with Fabry-P'{e}rot resistance oscillations of the ballistic graphene cavity. We compare our experiments with tight-binding calculations which include realistic graphene-superconductor interfaces and find a good qualitative agreement.

Fachgebiet (DDC)

530 Physik

Schlagwörter

current-phase relation; Graphene; Josephson junctions; SQUID

Zitieren

ISO 690

NANDA, G., J. L. AGUILERA-SERVIN, P. RAKYTA, Andor KORMÁNYOS, Reinhold KLEINER, Dieter KÖLLE, K. WATANABE, T. TANIGUCHI, L. M. K. VANDERSYPEN, S. GOSWAMI, 2016. Current-phase relation of ballistic graphene Josephson junctions. In: Nano Letters. 2016, 17(6), pp. 3396-3401. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.7b00097

BibTex

@article{Nanda2016-12-20T21:57:46ZCurre-39939,
  year={2016},
  doi={10.1021/acs.nanolett.7b00097},
  title={Current-phase relation of ballistic graphene Josephson junctions},
  number={6},
  volume={17},
  issn={1530-6984},
  journal={Nano Letters},
  pages={3396--3401},
  author={Nanda, G. and Aguilera-Servin, J. L. and Rakyta, P. and Kormányos, Andor and Kleiner, Reinhold and Kölle, Dieter and Watanabe, K. and Taniguchi, T. and Vandersypen, L. M. K. and Goswami, S.}
}

RDF

<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/39939">
    <dc:creator>Kormányos, Andor</dc:creator>
    <dc:contributor>Kormányos, Andor</dc:contributor>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2017-08-24T14:40:57Z</dc:date>
    <dc:creator>Vandersypen, L. M. K.</dc:creator>
    <dc:contributor>Watanabe, K.</dc:contributor>
    <dc:creator>Kölle, Dieter</dc:creator>
    <dc:creator>Watanabe, K.</dc:creator>
    <dc:creator>Taniguchi, T.</dc:creator>
    <dc:contributor>Aguilera-Servin, J. L.</dc:contributor>
    <dc:contributor>Nanda, G.</dc:contributor>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dc:contributor>Goswami, S.</dc:contributor>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/39939/1/Nanda_0-414361.pdf"/>
    <dc:creator>Kleiner, Reinhold</dc:creator>
    <dc:contributor>Kleiner, Reinhold</dc:contributor>
    <dc:contributor>Vandersypen, L. M. K.</dc:contributor>
    <dc:creator>Goswami, S.</dc:creator>
    <dc:creator>Rakyta, P.</dc:creator>
    <dc:contributor>Taniguchi, T.</dc:contributor>
    <dc:creator>Aguilera-Servin, J. L.</dc:creator>
    <dc:contributor>Rakyta, P.</dc:contributor>
    <dcterms:issued>2016-12-20T21:57:46Z</dcterms:issued>
    <dcterms:abstract xml:lang="eng">The current-phase relation (CPR) of a Josephson junction (JJ) determines how the supercurrent evolves with the superconducting phase difference across the junction. Knowledge of the CPR is essential in order to understand the response of a JJ to various external parameters. Despite the rising interest in ultra-clean encapsulated graphene JJs, the CPR of such junctions remains unknown. Here, we use a fully gate-tunable graphene superconducting quantum intereference device (SQUID) to determine the CPR of ballistic graphene JJs. Each of the two JJs in the SQUID is made with graphene encapsulated in hexagonal boron nitride. By independently controlling the critical current of the JJs, we can operate the SQUID either in a symmetric or asymmetric configuration. The highly asymmetric SQUID allows us to phase-bias one of the JJs and thereby directly obtain its CPR. The CPR is found to be skewed, deviating significantly from a sinusoidal form. The skewness can be tuned with the gate voltage and oscillates in anti-phase with Fabry-P\'{e}rot resistance oscillations of the ballistic graphene cavity. We compare our experiments with tight-binding calculations which include realistic graphene-superconductor interfaces and find a good qualitative agreement.</dcterms:abstract>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/39939/1/Nanda_0-414361.pdf"/>
    <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/39939"/>
    <dcterms:title>Current-phase relation of ballistic graphene Josephson junctions</dcterms:title>
    <dc:rights>Attribution-NonCommercial-NoDerivatives 4.0 International</dc:rights>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2017-08-24T14:40:57Z</dcterms:available>
    <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by-nc-nd/4.0/"/>
    <dc:creator>Nanda, G.</dc:creator>
    <dc:contributor>Kölle, Dieter</dc:contributor>
    <dc:language>eng</dc:language>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Ja