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Sökning: WFRF:(Chyi J. Y.)

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  • Polyakov, A. Y., et al. (författare)
  • Electrical and luminescent properties and the spectra of deep centers in GaMnN/InGaN light-emitting diodes
  • 2004
  • Ingår i: Journal of Electronic Materials. - : Springer Science and Business Media LLC. - 0361-5235 .- 1543-186X. ; 33:3, s. 241-247
  • Tidskriftsartikel (refereegranskat)abstract
    • Electrical and electroluminescent properties were studied for GaN/InGaN light-emitting diodes (LEDs) with the n-GaN layer up and with the top portion of the n layer made of undoped GaMnN to allow polarization modulation by applying an external magnetic field (so-called -spin-LEDs-). The contact annealing temperature was kept to 750°C, which is the thermal stability limit for retaining room-temperature magnetic ordering in the GaMnN layer. Measurable electroluminescence (EL) was obtained in these structures at threshold voltages of ∼15 V, with a lower EL signal compared to control LEDs without Mn. This is related to the existence of two parasitic junctions between the metal and the lower contact p-type layer and between the GaMnN and the n-GaN in the top contact layer.
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3.
  • Buyanova, Irina, 1960-, et al. (författare)
  • On the origin of spin loss in GaMnN/InGaN Light-Emitting Diodes
  • 2004
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 84, s. 2599-
  • Tidskriftsartikel (refereegranskat)abstract
    •  Spin polarization of GaMnN/InGaN light-emitting diodes grown by molecular beam epitaxy is analyzed. In spite of the ferromagnetic behavior of the GaMnN spin injector, the diodes are shown to exhibit very low efficiency of spin injection. Based on resonant optical orientation spectroscopy, the spin loss in the structures is shown to be largely due to fast spin relaxation within the InGaN spin detector, which itself destroys any spin polarization generated by optical spin orientation or electrical spin injection.
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6.
  • Chen, Weimin, 1959-, et al. (författare)
  • Spin relaxation in InGaN/Ga(Mn)N quantum wells
  • 2005
  • Ingår i: Bulletin of the American physical society. - 0003-0503. ; 50, s. 609-609
  • Tidskriftsartikel (refereegranskat)abstract
    • Proc. 2005 APS March Meeting, March 21-25, 2005; Los Angeles, CA, USA
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7.
  • Chen, Weimin, 1959-, et al. (författare)
  • Efficient spin relaxation in InGaN/GaN and InGaN/GaMnN quantum wells : An obstacle to spin detection
  • 2005
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 87:19, s. 192107-
  • Tidskriftsartikel (refereegranskat)abstract
    • Transient magneto-optical spectroscopy of InGaNGaN and InGaNGaMnN quantum wells reveals a spin relaxation process with a characteristic time of 50 ps. We show that the observed spin relaxation is mediated by spin flips of individual carriers rather than by direct exciton spin flips, and is proposed to occur near the bottom of the exciton band (K=0). Nearly complete thermalization between spin sublevels of the excitons, observed immediately after the pulsed photoexcitation, is attributed to even faster spin relaxation of photogenerated hot carriers/excitons accompanying momentum and energy relaxation at high K vectors. © 2005 American Institute of Physics.
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  • Resultat 1-8 av 8

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