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Title: Ultrafast magneto-photocurrents in GaAs: Separation of surface and bulk contributions

We induce ultrafast magneto-photocurrents in a GaAs crystal employing interband excitation with femtosecond laser pulses at room temperature and non-invasively separate surface and bulk contributions to the overall current response. The separation between the different symmetry contributions is achieved by measuring the simultaneously emitted terahertz radiation for different sample orientations. Excitation intensity and photon energy dependences of the magneto-photocurrents for linearly and circularly polarized excitations reveal an involvement of different microscopic origins, one of which is the inverse spin Hall effect. Our experiments are important for a better understanding of the complex momentum-space carrier dynamics in magnetic fields.
Authors:
; ;  [1] ;  [2]
  1. Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (Germany)
  2. Ioffe Institute, Politechnicheskaya 26, St. Petersburg 194021 (Russian Federation)
Publication Date:
OSTI Identifier:
22398851
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 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; CHARGE CARRIERS; CRYSTALS; ELECTROMAGNETIC PULSES; ENERGY DEPENDENCE; EXCITATION; GALLIUM ARSENIDES; HALL EFFECT; LASERS; MAGNETIC FIELDS; MAGNETISM; PHOTOCURRENTS; PHOTON EMISSION; PHOTONS; SPIN; SURFACES; TEMPERATURE RANGE 0273-0400 K