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Title: Electrically tunable localized tunneling channels in silicene nanoribbons

The topological phase of a silicene nanoribbon holding edge states in the bulk energy gap can be easily broken by an external electric field. Here, we show through low-energy Green's function calculations that it is possible to localize conducting channels anywhere in a silicene nanoribbon by applying an inhomogeneous electric field. The spin degeneracy of these channels can also be broken in the same manner, allowing conduction of spin as well as charge. On this basis, we suggest design of a ternary logic device, which could be used in low-power circuits. Our study demonstrates that silicene and related group IV elements with honeycomb structure could provide a platform for efficient manipulation of spin currents via external electric fields, without the need to switch magnetic fields for spintronics applications.
Authors:
 [1] ; ;  [2] ;  [1] ;  [3] ;  [4] ;  [5]
  1. Department of Physics, Tampere University of Technology, P.O. Box 692, 33101 Tampere (Finland)
  2. Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan (China)
  3. (United States)
  4. Graphene Research Centre and Department of Physics, National University of Singapore, Singapore 117542 (Singapore)
  5. Department of Physics, Northeastern University, Boston, Massachusetts 02115 (United States)
Publication Date:
OSTI Identifier:
22267753
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; ELECTRIC FIELDS; ENERGY GAP; GREEN FUNCTION; HONEYCOMB STRUCTURES; MAGNETIC FIELDS; NANOSTRUCTURES; SPIN; SWITCHES; TUNNEL EFFECT