CurrentPhase Relation in Graphene and Application to a Superconducting Quantum Interference Device

Abstract

Graphene exhibits unique electrical properties on account of its reduced dimensionality and neutrino-like massless Dirac fermion quasiparticle spectrum. When contacted with two superconducting electrodes, graphene can support Cooper pair transport, resulting in the well-known Josephson effect. The currentphase relation in a ballistic graphene Josephson junction is unique, and could provide a signature for the detection of ballistic Dirac fermions. This relation can be measured experimentally either directly via incorporation of graphene in an RF superconducting quantum interference device (SQUID) or indirectly via a dc-SQUID. We calculate the expected flux modulation of the switching current in the case of the dc-SQUID and compare the results to a previous experiment. Further experiments investigating the currentphase relation in graphene are promising for the observation of ballistic Dirac fermions

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Document Details

Document Type
Technical Report
Publication Date
Nov 18, 2009
Accession Number
AD1007164

Entities

People

  • A. Zettl
  • Caglar Girit
  • Irfan Siddiqi
  • M. F. Crommie
  • Ofer Naaman
  • Vincent Bouchiat
  • Yuanbo Zhang

Organizations

  • University of California, Berkeley

Tags

DTIC Thesaurus Topics

  • Band Structures
  • Detection
  • Electrical Properties
  • Fermions
  • Geometry
  • Graphene
  • Inductance
  • Josephson Junctions
  • Magnetic Fields
  • Magnetic Flux
  • Magnetometers
  • Materials
  • Materials Science
  • Mean Free Path
  • Quasiparticles
  • Scattering
  • Square Roots

Fields of Study

  • Physics

Readers

  • Aerospace Research.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene
  • Quantum Computing