Time-resolved two-photon excitation of dark states in quantum dots

被引：5
作者：
Gautham, C. [1 ]
Snoke, D. W. [1 ]
Rastelli, A. [2 ]
Schmidt, O. G. [2 ]
机构：
[1] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
[2] Inst Integrat Nanosci, D-01069 Dresden, Germany
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 14期
基金：
美国国家科学基金会;
关键词：
ELECTRON-SPIN; INAS; DYNAMICS; EXCITON;
D O I：
10.1063/1.4871379
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have performed time-resolved measurements of the time scale for conversion of excitons in dark states to bright (light-emitting) states in GaAs quantum dots. The dark states are pumped using two-photon absorption, while the bright state emission is observed in single-photon emission. This conversion time is connected to the spin flip time for carriers in the quantum dots. The time scale is found to be of the order of several hundred picoseconds. (C) 2014 AIP Publishing LLC.
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页数：4
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共 24 条
  • [1] Fine structure of neutral and charged excitons in self-assembled In(Ga)As/(Al)GaAs quantum dots -: art. no. 195315
    Bayer, M
    Ortner, G
    Stern, O
    Kuther, A
    Gorbunov, AA
    Forchel, A
    Hawrylak, P
    Fafard, S
    Hinzer, K
    Reinecke, TL
    Walck, SN
    Reithmaier, JP
    Klopf, F
    Schäfer, F
    [J]. PHYSICAL REVIEW B, 2002, 65 (19) : 1953151 - 19531523
  • [2] INTRINSIC MECHANISM FOR THE POOR LUMINESCENCE PROPERTIES OF QUANTUM-BOX SYSTEMS
    BENISTY, H
    SOTOMAYORTORRES, CM
    WEISBUCH, C
    [J]. PHYSICAL REVIEW B, 1991, 44 (19) : 10945 - 10948
  • [3] Optical spectroscopy of quasimonolayer InAs at the onset of quantum-dot nucleation
    Bhatti, AS
    Alessi, MG
    Capizzi, M
    Frigeri, P
    Franchi, S
    [J]. PHYSICAL REVIEW B, 1999, 60 (04): : 2592 - 2598
  • [4] Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
    Bulaev, DV
    Loss, D
    [J]. PHYSICAL REVIEW B, 2005, 71 (20)
  • [5] Spin-flip phonon-mediated charge relaxation in double quantum dots
    Danon, J.
    [J]. PHYSICAL REVIEW B, 2013, 88 (07)
  • [6] De Greve K, 2011, NAT PHYS, V7, P872, DOI [10.1038/nphys2078, 10.1038/NPHYS2078]
  • [7] Stress dependence of exciton relaxation processes in Cu2O -: art. no. 085211
    Denev, S
    Snoke, DW
    [J]. PHYSICAL REVIEW B, 2002, 65 (08): : 1 - 8
  • [8] Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states
    Efros, AL
    Rosen, M
    Kuno, M
    Nirmal, M
    Norris, DJ
    Bawendi, M
    [J]. PHYSICAL REVIEW B, 1996, 54 (07): : 4843 - 4856
  • [9] Elzerman JM, 2004, NATURE, V430, P431, DOI 10.1039/nature02693
  • [10] Nonequilibrium transport through a vertical quantum dot in the absence of spin-flip energy relaxation
    Fujisawa, T
    Austing, DG
    Tokura, Y
    Hirayama, Y
    Tarucha, S
    [J]. PHYSICAL REVIEW LETTERS, 2002, 88 (23) : 4
123