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Title: All-optical evaluation of spin-orbit interaction based on diffusive spin motion in a two-dimensional electron gas

A method is presented that enables the measurement of spin-orbit coefficients in a diffusive two-dimensional electron gas without the need for processing the sample structure, applying electrical currents or resolving the spatial pattern of the spin mode. It is based on the dependence of the average electron velocity on the spatial distance between local excitation and detection of spin polarization, resulting in a variation of spin precession frequency that in an external magnetic field is linear in the spatial separation. By scanning the relative positions of the exciting and probing spots in a time-resolved Kerr rotation microscope, frequency gradients along the [100] and [010] crystal axes of GaAs/AlGaAs QWs are measured to obtain the Rashba and Dresselhaus spin-orbit coefficients, α and β. This simple method can be applied in a variety of materials with electron diffusion for evaluating spin-orbit coefficients.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3] ;  [4]
  1. IBM Research–Zürich, Säumerstrasse 4, CH-8803 Rüschlikon (Switzerland)
  2. (Japan)
  3. Institute of Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg (Germany)
  4. Solid State Physics Laboratory, ETH Zürich, CH-8093 Zürich (Switzerland)
Publication Date:
OSTI Identifier:
22485966
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; 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:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM ARSENIDES; DETECTION; ELECTRIC CURRENTS; ELECTRON GAS; ELECTRONS; EVALUATION; EXCITATION; GALLIUM ARSENIDES; L-S COUPLING; MAGNETIC FIELDS; MICROSCOPES; PRECESSION; ROTATION; SPIN; SPIN ORIENTATION; TIME RESOLUTION; TWO-DIMENSIONAL SYSTEMS