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Title: Photon induced tunneling of electron through a graphene electrostatic barrier

The influence of an external intense laser field on the tunneling transport (ballistic) of the Dirac fermions through a monolayer graphene electrostatic barrier is studied in the framework of the Floquet approach for a continuous wave, linearly polarized, monochromatic laser. The Klein tunneling is shown to be suppressed by the irradiation of a strong laser field, arising due to breaking of chiral symmetry. The symmetric nature of the field free angular transmission spectrum around the normal to the well-barrier interface is destroyed due to the additional coupling between the pseudo-spin and the time dependent vector potential. The energy distribution of the tunneling spectrum displays Fano resonance which is absent for a laser assisted conventional electrostatic barrier but similar to the case of quantum well structures, providing an optical tool to identify field free quasi bound states inside the graphene nanostructures.
Authors:
 [1] ;  [2]
  1. Department of Physics, P.K. College, Contai, Purba Medinipur, West Bengal 721401 (India)
  2. Department of Theoretical Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India)
Publication Date:
OSTI Identifier:
22217868
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BOUND STATE; CHIRAL SYMMETRY; ELECTRONS; ENERGY SPECTRA; GRAPHENE; INTERFACES; LASER RADIATION; LASERS; MONOCHROMATIC RADIATION; PHOTONS; QUANTUM WELLS; SPIN; TIME DEPENDENCE; TUNNEL EFFECT