skip to main content

Title: Enlarged band gap and electron switch in graphene-based step-barrier structure

We study the transmission through a step-barrier in gapped graphene and propose a method to enlarge the band gap. The step-barrier structure consists of two or more barriers with different strengths. It is found that the band gap could be effectively enlarged and controlled by adjusting the barrier strengths in the light of the mass term. Klein tunneling at oblique incidence is suppressed due to the asymmetry of step-barrier, contrary to the cases in single-barrier and superlattices. Furthermore, a tunable conductance channel could be opened up in the conductance gap, suggesting an application of the structure as an electron switch.
Authors:
;  [1] ;  [2] ;  [1]
  1. School of Science, Linyi University, 276005 Linyi (China)
  2. (China)
Publication Date:
OSTI Identifier:
22254138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 19; 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; ELECTRONS; GRAPHENE; SUPERLATTICES; SWITCHES; TUNNEL EFFECT