Unconventional scanning tunneling conductance spectra for graphene

Saha, K. ; Paul, I. ; Sengupta, K. (2010) Unconventional scanning tunneling conductance spectra for graphene Physical Review B: Condensed Matter and Materials Physics, 81 (16). 165446_1-165446_6. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v81/i16/e165446

Related URL: http://dx.doi.org/10.1103/PhysRevB.81.165446

Abstract

We compute the tunneling conductance of graphene as measured by a scanning tunneling microscope (STM) with a normal/superconducting tip. We demonstrate that for undoped graphene with zero Fermi energy, the first derivative of the tunneling conductance with respect to the applied voltage is proportional to the density of states of the STM tip. We also show that the shape of the STM spectra for graphene doped with impurities depends qualitatively on the position of the impurity atom in the graphene matrix and relate this unconventional phenomenon to the pseudospin symmetry of the Dirac quasiparticles in graphene. We suggest experiments to test our theory.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:81315
Deposited On:06 Feb 2012 05:08
Last Modified:18 May 2016 22:55

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