Cascade and Accumulation of Spin at CuPc/GaAs (100) interface

ORAL

Abstract

We have investigated the spin dynamics in organic semiconductor, copper phthalocyanine (CuPc), with spin and time resolved two photon photoemission spectroscopy (STR-2PPE). Spin polarized electrons are generated optically from GaAs substrate, and injected into the unoccupied states of CuPc film. The apparent spin relaxation time is observed to have strong energy dependence. The spin polarization at high energy levels decreases much faster than that of the low energy levels. The experimental results are then explained by a cascade model. The calculation suggests that the spin information of the hot electrons can be well preserved during the energy relaxation process.

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Authors

  • Huanjun Ding

    • Department of Physics and Astronomy, University of Rochester

  • Irfan Irfan

    • Department of Physics and Astronomy, University of Rochester

  • Yongli Gao

    • university of rochester
    • Department of Physics and Astronomy, University of Rochester

  • Mirko Cinchetti

    • Department of Physics, University of Kaiserslautern

  • Marina Sanchez-Albaneda

    • Department of Physics, University of Kaiserslautern

  • Jan-Peter Wustenberg

    • Department of Physics, University of Kaiserslautern

  • Oleksiy Andreyev

    • Department of Physics, University of Kaiserslautern

  • Michael Bauer

    • Department of Physics, University of Kaiserslautern

  • Martin Aeschlimann

    • Department of Physics, University of Kaiserslautern