TITLE

Evidence of type-I direct recombination in InP/GaP quantum dots via magnetoluminescence

AUTHOR(S)
Dewitz, C. v.; Hatami, F.; Millot, M.; Broto, J. M.; Léotin, J.; Masselink, W. T.
PUB. DATE
October 2009
SOURCE
Applied Physics Letters;10/12/2009, Vol. 95 Issue 15, p151105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Photoluminescence from InP quantum dots within a GaP matrix is investigated as a function of magnetic field. By fitting the magnetoluminescence data to the energy states of the electrons and holes confined in quantum dots in a perpendicular magnetic field, the electron-hole reduced effective mass is determined to be 0.094m0. The diamagnetic shift in the luminescence peak gives an average exciton radius of about 5 nm, smaller than the dot radius. These results indicate that the recombining electrons are primarily composed of states originating from the InP Γ valley although the conduction band discontinuity between the InP and the GaP barrier is expected to be very small or even negative.
ACCESSION #
44665215

 

Related Articles

  • Magneto-optical interband transitions in semiconductor quantum dots : evidence for excitonic polarons. Preisler, V.; Grange, T.; Ferreira, R.; de Vaulchier, L. A.; Guldner, Y.; Teran, F. J.; Potemski, M.; Lemaître, A. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p985 

    We investigate the interband transitions of self-assembled InAs/GaAs quantum dots by using resonant photoluminescence spectroscopy under strong magnetic field. Well defined resonances are observed in the spectra. A strong anti crossing between two transitions is observed, which cannot be...

  • Charged exciton creation with two-color optical excitation method and analysis of initialization process of electron spin qubit in quantum dots. Gotoh, Hideki; Sanada, Haruki; Yamaguchi, Hiroshi; Sogawa, Tetsuomi // Journal of Applied Physics;Jun2012, Vol. 111 Issue 12, p123520 

    An optical pumping method for creating charged excitons in semiconductor quantum dots is studied using a micro-photoluminescence (PL) technique with a two-color excitation method. This method employs two laser sources whose energies are in the resonant and non-resonant barrier excitation...

  • Excitonic Fock-Darwin Spectrum Of A Single Quantum Dot. Babinski, A.; Potemski, M.; Raymond, S.; Lapointe, J.; Wasilewski, Z. R.; Baranowski, J. M. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p905 

    Optical spectroscopy of a highly-excited single InAs/GaAs self-assembled quantum dot (QD) has been performed. The multiexcitonic emission from the s-, p-, and d-shells of the dot is observed and investigated in magnetic field up to 14T. Effects of interaction between the multiexcitonic...

  • Temperature dependence of electron-spin relaxation in a single InAs quantum dot at zero applied magnetic field. Dou, X. M.; Sun, B. Q.; Jiang, D. S.; Ni, H. Q.; Niu, Z. C. // Journal of Applied Physics;Mar2012, Vol. 111 Issue 5, p053524 

    The temperature-dependent electron spin relaxation of positively charged excitons in a single InAs quantum dot was measured by time-resolved photoluminescence spectroscopy at zero applied magnetic fields. The experimental results show that the electron-spin relaxation is clearly divided into two...

  • Spin-hybridization effects in quantum dots. Trallero-Giner, C.; Alcalde, A. M.; López-Richard, V.; Prado, S. J.; Marques, G. E. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p637 

    A systematic study of spin-hybridization of states in semiconductor quantum dots under applied magnetic field is presented. The g-factors for electron, heavy- and light-hole carriers and for excitonic states, as well as the diamagnetic coefficient have been calculated for CdTe quantum dots. Our...

  • Electrical charging of a single quantum dot by a spin polarized electron. Ghali, M.; Kümmell, T.; Wenisch, J.; Brunner, K.; Bacher, G. // Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p073107 

    Voltage controlled electrical charging of a single InAs quantum dot by a spin polarized electron from a ZnMnSe spin aligner is presented, and the spin information is read out optically. We demonstrate that the characteristic single quantum dot photoluminescence polarization pattern of the...

  • Origin of ultraviolet photoluminescence in ZnO quantum dots: Confined excitons versus surface-bound impurity exciton complexes. Fonoberov, Vladimir A.; Balandin, Alexander A. // Applied Physics Letters;12/13/2004, Vol. 85 Issue 24, p5971 

    We have theoretically investigated the origin of ultraviolet photoluminescence (PL) in ZnO quantum dots with diameters from 2 to 6 nm. Two possible sources of ultraviolet PL have been considered: excitons confined in the quantum dot and excitons bound to an ionized impurity located at the...

  • Photoluminescence of localized excitons in InGan quantum dots. Usov, S.; Tsatsul’nikov, A.; Lundin, V.; Sakharov, A.; Zavarin, E.; Ledentsov, N. // Semiconductors;Feb2008, Vol. 42 Issue 2, p188 

    Photoluminescence spectra of samples with ultrathin InGaN layers embedded in AlGaN and GaN matrices are studied experimentally in the temperature range of 80 to 300 K. It is shown that the temperature dependences can be understood in the context of Eliseev’s model and that, in the active...

  • Splitting of excitons and biexcitons in coupled InAs quantum dot molecules. Xu, Xiulai; Williams, D. A.; Cleaver, J. R. A. // Applied Physics Letters;1/3/2005, Vol. 86 Issue 1, p012103 

    Coupling in laterally coupled InAs quantum dot molecules has been observed by conventional microscopic photoluminescence spectroscopy. At low excitation intensity, splitting of exciton emission is observed, and this is ascribed to recombination of bonding and antibonding states when two quantum...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics