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Title: Rashba-Zeeman-effect-induced spin filtering energy windows in a quantum wire

We perform a numerical study on the spin-resolved transport in a quantum wire (QW) under the modulation of both Rashba spin-orbit coupling (SOC) and a perpendicular magnetic field by using the developed Usuki transfer-matrix method in combination with the Landauer-B├╝ttiker formalism. Wide spin filtering energy windows can be achieved in this system for unpolarized spin injection. In addition, both the width of energy window and the magnitude of spin conductance within these energy windows can be tuned by varying Rashba SOC strength, which can be apprehended by analyzing the energy dispersions and spin-polarized density distributions inside the QW, respectively. Further study also demonstrates that these Rashba-SOC-controlled spin filtering energy windows show a strong robustness against disorders. These findings may not only benefit to further understand the spin-dependent transport properties of a QW in the presence of external fields but also provide a theoretical instruction to design a spin filter device.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. School of Computer, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004 (China)
  2. School of Mechatronics Engineering, East China Jiaotong University, Nanchang 330013 (China)
  3. Department of Physics and Key Laboratory for Low-Dimensional Quantum Structures and Manipulation (Ministry of Education), Hunan Normal University, Changsha 410081 (China)
  4. Office of Scientific Research, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004 (China)
Publication Date:
OSTI Identifier:
22304146
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 22; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; DENSITY; DISPERSIONS; DISTRIBUTION; FILTERS; INJECTION; L-S COUPLING; MAGNETIC FIELDS; MODULATION; NANOWIRES; NUMERICAL ANALYSIS; QUANTUM WIRES; SPIN; SPIN ORIENTATION; TRANSFER MATRIX METHOD; ZEEMAN EFFECT