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Title: Electronic Bloch oscillation in bilayer graphene gradient superlattices

We investigate the electronic Bloch oscillation in bilayer graphene gradient superlattices using transfer matrix method. By introducing two kinds of gradient potentials of square barriers along electrons propagation direction, we find that Bloch oscillations up to terahertz can occur. Wannier-Stark ladders, as the counterpart of Bloch oscillation, are obtained as a series of equidistant transmission peaks, and the localization of the electronic wave function is also signature of Bloch oscillation. Furthermore, the period of Bloch oscillation decreases linearly with increasing gradient of barrier potentials.
Authors:
; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics, Beijing Normal University, Beijing 100875 (China)
  2. (China)
  3. Department of Physics, Zhejiang University, Hangzhou 310027 (China)
  4. Beijing Computational Science Research Center, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22310882
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRIC POTENTIAL; ELECTRONS; GRAPHENE; LAYERS; OSCILLATIONS; SUPERLATTICES; TRANSFER MATRIX METHOD; TRANSMISSION; WAVE FUNCTIONS