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Title: Spin selector based on periodic diluted-magnetic-semiconductor/nonmagnetic-barrier superlattices

We propose a spin selector based on periodic diluted-magnetic-semiconductor/nonmagnetic-barrier (DMS/NB) superlattices subjected to an external magnetic field. We find that the periodic DMS/NB superlattices can achieve 100% spin filtering over a dramatically broader range of incident energies than the diluted-magnetic-semiconductor/semiconductor (DMS/S) case studied previously. And the positions and widths of spin-filtering bands can be manipulated effectively by adjusting the geometric parameters of the system or the strength of external magnetic field. Such a compelling filtering feature stems from the introduction of nonmagnetic barrier and the spin-dependent giant Zeeman effect induced by the external magnetic field. We also find that the external electric field can exert a significant influence on the spin-polarized transport through the DMS/NB superlattices.
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084 (China)
  2. (China)
  3. Department of Physics, South China University of Technology, Guangzhou 510641 (China)
Publication Date:
OSTI Identifier:
22493938
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 7; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRIC FIELDS; INTERFACES; MAGNETIC FIELDS; MAGNETIC SEMICONDUCTORS; PERIODICITY; POLARIZATION; SPIN; SPIN ORIENTATION; SUPERLATTICES; ZEEMAN EFFECT