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Title: Valley filter from magneto-tunneling between single and bi-layer graphene

We consider tunneling transport between two parallel graphene sheets; where one is a single-layer sample and the other one a bi-layer. In the presence of an in-plane magnetic field, the interplay between combined energy and momentum conservation in a tunneling event and the distinctive chiral nature of charge carriers in the two systems turns out to favor tunneling of electrons from one of the two valleys in the graphene Brillouin zone. Adjusting the field strength enables manipulation of the valley polarization of the current, which reaches its maximum value of 100% concomitantly with a maximum of the tunneling conductance.
Authors:
 [1] ;  [1] ;  [2]
  1. School of Chemical and Physical Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington 6140 (New Zealand)
  2. (United States)
Publication Date:
OSTI Identifier:
22293104
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 8; 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; BRILLOUIN ZONES; CHARGE CARRIERS; ELECTRONS; GRAPHENE; LAYERS; MAGNETIC FIELDS; POLARIZATION; TUNNEL EFFECT