Spin-polarized light-emitting diodes with Mn-doped InAs quantum dot nanomagnets as a spin aligner

Nano Lett. 2005 Feb;5(2):209-12. doi: 10.1021/nl048613n.

Abstract

We have fabricated and characterized surface-emitting, spin-polarized light-emitting diodes with a Mn-doped InAs dilute magnetic quantum dot spin-injector and contact region grown by low-temperature molecular beam epitaxy, and an In(0.4)Ga(0.6)As quantum dot active region. Energy-dispersive X-ray and electron energy loss spectroscopies performed on individual dots indicate that the Mn atoms incorporate within the dots themselves. Circularly polarized light is observed up to 160 K with a maximum degree of circular polarization of 5.8% measured at 28 K, indicating high-temperature spin injection and device operation.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Anisotropy
  • Arsenicals / chemistry*
  • Arsenicals / radiation effects
  • Indium / chemistry*
  • Indium / radiation effects
  • Light
  • Magnetics*
  • Manganese / chemistry*
  • Manganese / radiation effects
  • Materials Testing
  • Nanotechnology / methods*
  • Nanotubes / analysis
  • Nanotubes / chemistry*
  • Nanotubes / radiation effects
  • Nanotubes / ultrastructure*
  • Particle Size
  • Quantum Dots*
  • Semiconductors
  • Spin Labels

Substances

  • Arsenicals
  • Spin Labels
  • Indium
  • Manganese
  • indium arsenide