Compact vacuum tubes with GaAs(Cs,O) photocathodes for studying spin-dependent phenomena

V. L. Alperovich, D. A. Orlov, V. G. Grishaev, S. N. Kosolobov, A. S. Jaroshevich, H. E. Scheibler, A. S. Terekhov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Compact proximity focused vacuum tubes with GaAs(Cs,O) photocathodes are used for experimental studying spindependent phenomena. Firstly, spin-dependent emission of optically oriented electrons from p-GaAs(Cs,O) into vacuum in a magnetic field normal to the surface was observed in a nonmagnetic vacuum diode. This phenomenon is explained by the jump in the electron g-factor at the semiconductor-vacuum interface. Due to this jump, the effective electron affinity on the semiconductor surface depends on the mutual direction of optically oriented electron spins and the magnetic field, resulting in the spin-dependent photoemission. It is demonstrated that the observed effect can be used for the determination of spin diffusion length in semiconductors. Secondly, we developed a prototype of a new spin filter, which consists of a vacuum tube with GaAs(Cs,O) photocathode and a nickel-covered venetian blind dynode. Preliminary results on spin-dependent reflection of electrons from the oxidized polycrystal nickel layer are presented.

Original languageEnglish
Title of host publicationSpintronics II
DOIs
Publication statusPublished - 2009
Externally publishedYes
EventSpintronics II - San Diego, CA, United States
Duration: 2 Aug 20095 Aug 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7398
ISSN (Print)0277-786X

Conference

ConferenceSpintronics II
Country/TerritoryUnited States
CitySan Diego, CA
Period2/08/095/08/09

Keywords

  • Ferromagnetic layers
  • GaAs
  • Negative electron affinity photocathodes
  • Optical orientation
  • Spin-dependent photoemission

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