title: Spin-polarized light-emitting diodes with Mn-doped InAs quantum dot nanomagnets as a spin aligner.
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.
authors.affiliation: Solid State Electronics Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109-2122, USA.
authors.forename: Subhananda
authors.initials: S
authors.lastname: Chakrabarti
authors.forename: Michael A
authors.initials: MA
authors.lastname: Holub
authors.forename: Pallab
authors.initials: P
authors.lastname: Bhattacharya
authors.forename: Tetsuya D
authors.initials: TD
authors.lastname: Mishima
authors.forename: Michael B
authors.initials: MB
authors.lastname: Santos
authors.forename: Matthew B
authors.initials: MB
authors.lastname: Johnson
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Blom
mesh_terms: D016880:Anisotropy; D001152:Arsenicals / Q000737:chemistry* / Q000528:radiation effects; D007204:Indium / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008280:Magnetics; D008345:Manganese / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D010316:Particle Size; D045663:Quantum Dots; D012666:Semiconductors; D013113:Spin Labels
chemical_list: D001152:Arsenicals; D013113:Spin Labels; D007204:Indium; D008345:Manganese; C076773:indium arsenide