Monte Carlo modeling of spin-polarized photoemission from p -doped bulk GaAs

Oksana Chubenko, Siddharth Karkare, Dimitre A. Dimitrov, Jai Kwan Bae, Luca Cultrera, Ivan Bazarov, Andrei Afanasev

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The anticorrelation between quantum efficiency (QE) and electron spin polarization (ESP) from a p -doped GaAs activated to negative electron affinity is studied in detail using an ensemble Monte Carlo approach. The photoabsorption, momentum and spin relaxation during transport, and tunneling of electrons through the surface potential barrier are modeled to identify fundamental mechanisms, which limit the efficiency of GaAs spin-polarized electron sources. In particular, we study the response of QE and ESP to various parameters, such as the photoexcitation energy, doping density, and electron affinity level. Our modeling results for various transport and emission characteristics are in good agreement with available experimental data. Our findings show that the behavior of both QE and ESP at room temperature can be fully explained by the bulk relaxation mechanisms and the time that electrons spend in the material before being emitted.

Original languageEnglish (US)
Article number063101
JournalJournal of Applied Physics
Volume130
Issue number6
DOIs
StatePublished - Aug 14 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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