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Title: Spin coherence of the two-dimensional electron gas in a GaAs quantum well

The coherent spin dynamics of the quasi-two-dimensional electron gas in a GaAs quantum well is experimentally investigated using the time-resolved spin Kerr effect in an optical cryostat with a split coil inducing magnetic fields of up to 6 T at a temperature of about 2 K. The electron spin dephasing times and degree of anisotropy of the spin relaxation of electrons are measured in zero magnetic field at different electron densities. The dependence of the spin-orbit splitting on the electron-gas density is established. In the integral quantum-Hall-effect mode, the unsteady behavior of the spin dephasing time of 2D electrons of the lower Landau spin sublevel near the odd occupation factor ν = 3 is found. The experimentally observed unsteady behavior of the spin dephasing time can be explained in terms of new-type cyclotron modes that occur in a liquid spin texture.
Authors:
 [1]
  1. Institute of Solid State Physics (Russian Federation)
Publication Date:
OSTI Identifier:
22470132
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 49; Journal Issue: 1; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRON DENSITY; ELECTRON GAS; ELECTRONS; GALLIUM ARSENIDES; HALL EFFECT; INTEGRALS; KERR EFFECT; LIQUIDS; MAGNETIC FIELDS; QUANTUM WELLS; RELAXATION; SPIN; TEXTURE; TIME RESOLUTION; TWO-DIMENSIONAL SYSTEMS