Model potential of dimer system and coherence length of electron injected by scanning tunneling microscope on Ge(001) surface

Kawai, Hiroshi; Yoshimoto, Yoshihide; Narikiyo, Osamu; Hanawa, Yosuke; Imamura, Akimasa

doi:10.1016/j.susc.2008.07.028

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2010

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“…A number of unusual features [3] of superconducting state have been predicted [4,5] which are closely related to the Dirac-like spectrum of normal state excitation [6][7][8][9]. In particular, the unconventional normal electron dispertion [10] has been shown to result in a nontrivial modification of Andreev reflection and Andreev bound states in Josephson junctions [11] with supercomducting graphene electrodes [12,13].…”

Section: Introductionmentioning

confidence: 99%

Josephson effect in graphene SNS junction with a single localized defect

Bolmatov

Mou

2010

Physica B: Condensed Matter

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Imperfections change essentially the electronic transport properties of graphene. Motivated by a recent experiment reporting on the possible application of graphene as junctions, we study transport properties in graphene-based junctions with single localized defect. We solve the Dirac-Bogoliubovde-Gennes equation with a single localized defect superconductor-normal(graphene)-superconductor (SNS) junction. We consider the properties of tunneling conductance and Josephson current through an undoped strip of graphene with heavily doped s-wave superconducting electrodes in the limit l def ≪ L ≪ ξ. We find that spectrum of Andreev bound states are modified in the presence of single localized defect in the bulk and the minimum tunneling conductance remains the same. The Josephson junction exhibits sign oscillations.

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