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Title: Asymmetric edge modes by staggered potential in honeycomb lattice: Spin splitter

In honeycomb lattice with staggered potential such as silicene nanoribbon (SN) as used for illustrations here, we show that the lack of inversion symmetry due to buckled structure can lead to asymmetric edge modes where only one edge is utilized in transport, yielding no cross-walk (due to size effect) between edges. We also find asymmetric Hall accumulations formed because of the presence of staggered potential. Applying two opposite out-of-plane electric fields to two adjacent SNs appropriately, so that cross-walk occurs between two internal edge states, the bulk states serve as a spin-splitter that splits two specious of spins (spin-up and spin-down) into those two SNs. The spin-splitter proposed here does not require any magnetic field and thus manipulates spins in a full electric manner.
Authors:
 [1] ;  [2] ; ;  [3]
  1. Department of Applied Physics and Chemistry, University of Taipei, Taipei 10048, Taiwan (China)
  2. Department of Applied Physics, National University of Kaohsiung, Kaohsiung 81148, Taiwan (China)
  3. Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan (China)
Publication Date:
OSTI Identifier:
22410018
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ASYMMETRY; ELECTRIC FIELDS; HALL EFFECT; MAGNETIC FIELDS; NANOSTRUCTURES; POTENTIALS; SILICON; SPIN; SYMMETRY