Spin-controlled LEDs and VCSELs

S. Hövel, N. C. Gerhardt, C. Brenner, M. R. Hofmann, F. Y. Lo, D. Reuter, A. D. Wieck, E. Schuster, W. Keune

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12 Citations (Scopus)

Abstract

Two different concepts for transferring spin-optoelectronics to practical room temperature operation devices are explained. First, electrical spin injection in the absence of an external magnetic field and up to room temperature is demonstrated for the first time using Fe/Tb-multilayers as Schottky-injectors on common LED-strucrures. Complete switching of the polarization from one orientation to the opposite is feasible within ±0.3 T. Second, the amplification of spin-information in vertical-cavity surface-emitting lasers (VCSELs) is demonstrated by optical test experiments. The output polarization of the VCSEL is unambiguously controlled by the polarized optical excitation. Furthermore, only a spin polarization degree of 30% for the electrons in the active region is required to generate a 100% polarized emission at room temperature for both pulsed and continuous optical excitation. Finally, we suggest a combination of both concepts in an electrically pumped spin-VCSEL.

Original languageEnglish
Pages (from-to)500-507
Number of pages8
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume204
Issue number2
DOIs
Publication statusPublished - 2007 Feb 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Hövel, S., Gerhardt, N. C., Brenner, C., Hofmann, M. R., Lo, F. Y., Reuter, D., Wieck, A. D., Schuster, E., & Keune, W. (2007). Spin-controlled LEDs and VCSELs. Physica Status Solidi (A) Applications and Materials Science, 204(2), 500-507. https://doi.org/10.1002/pssa.200673219