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Title: Extended coherence length of spatially oscillating electron-spin polarization in dilute-magnetic-semiconductor quantum wells

We have investigated the possibility that the coherence length of spatially oscillating electron-spin polarization is improved in dilute magnetic semiconductors. In usual nonmagnetic quantum wells, the spin polarization of the electrons injected from a ferromagnetic source electrode oscillates spatially because of the spin precession due to spin-orbit effective magnetic fields, i.e., the Rashba and Dresselhaus fields. However, the polarization is damped within an oscillation period by the D’yakonov-Perel’ spin relaxation. In paramagnetic dilute magnetic semiconductors, impurity spin polarization is induced under the electron-spin polarization, and this impurity polarization influences the electron-spin precession and possibly improves the spatial electron-spin coherence. The validity of this effect is demonstrated by a numerical simulation for a CdMnTe quantum well.
Authors:
 [1]
  1. Division of Applied Physics, Faculty of Engineering, Hokkaido University (Hokudai), Sapporo 060-8628 (Japan)
Publication Date:
OSTI Identifier:
22261860
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1566; Journal Issue: 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 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; COHERENCE LENGTH; COMPUTERIZED SIMULATION; ELECTRONS; MAGNETIC FIELDS; MAGNETIC SEMICONDUCTORS; OSCILLATIONS; PARAMAGNETISM; POLARIZATION; PRECESSION; QUANTUM WELLS; RELAXATION; SPIN; SPIN ORIENTATION