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Applied Physics Letters / Volume 85 / Issue 17 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 85, 3839 (2004); http://dx.doi.org/10.1063/1.1807959 (3 pages)

Anisotropic photoconductivity of InGaAs quantum dot chains measured by terahertz pulse spectroscopy

D. G. Cooke1, F. A. Hegmann1, Yu. I. Mazur2, W. Q. Ma2, X. Wang2, Z. M. Wang2, G. J. Salamo2, M. Xiao2, T. D. Mishima3, and M. B. Johnson3

1Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada
2Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701
3Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019

(Received 14 May 2004; accepted 21 August 2004)

We report results of time-resolved terahertz (THz) pulse spectroscopy experiments on laterally ordered chains of self-assembled InGaAs quantum dots photoexcited with 400 nm, 100 fs laser pulses. A large anisotropy in the transient photoconductive response is observed depending on the polarization of the THz probe pulse with respect to the orientation of the dot chains. Fast (3.5–5 ps) and efficient carrier capture into the dots and one-dimensional wetting layers underneath the dot chains is observed below 90 K. At higher temperatures, thermionic emission into the two-dimensional wetting layers and barriers becomes significant and the anisotropy in the photoconductive signal is reduced.

© 2004 American Institute of Physics

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KEYWORDS and PACS

Keywords

indium compounds, gallium arsenide, III-V semiconductors, semiconductor quantum dots, photoexcitation, electron traps, hole traps, photoconductivity, thermionic emission, time resolved spectra

PACS

  • 73.63.Kv

    Quantum dots

  • 72.40.+w

    Photoconduction and photovoltaic effects

  • 79.40.+z

    Thermionic emission

  • 72.20.Jv

    Charge carriers: generation, recombination, lifetime, and trapping

  • 78.67.Hc

    Quantum dots

  • 78.47.-p

    Spectroscopy of solid state dynamics

  • 61.80.Ba

    Ultraviolet, visible, and infrared radiation effects (including laser radiation)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1807959

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    H. C. Liu, M. Gao, J. McCaffrey, Z. R. Wasilewski, and S. Fafard, Appl. Phys. Lett. 78, 79 (2001)APPLAB000078000001000079000001.

    Yu. I. Mazur, W. Q. Ma, X. Wang, Z. M. Wang, G. J. Salamo, M. Xiao, T. D. Mishima, and M. B. Johnson, Appl. Phys. Lett. 83, 987 (2003)APPLAB000083000005000987000001., See also W. Q. Ma, M. L. Hussein, J. L. Shultz, G. J. Salamo, T. D. Mishima, and M. B. Johnson, Phys. Rev. B 69, 233312 (2004).

    Z. M. Wang, K. Holmes, Yu. I. Mazur, and G. J. Salamo, Appl. Phys. Lett. 84, 1931 (2004)APPLAB000084000011001931000001.

    M. C. Beard, G. M. Turner, and C. A. Schmuttenmaer, Phys. Rev. B 62, 15764 (2000).

    K. P. H. Lui and F. A. Hegmann, Appl. Phys. Lett. 78, 3478 (2001)APPLAB000078000022003478000001.

    J. Shan, F. Wang, E. Knoesel, M. Bonn, and T. F. Heinz, Phys. Rev. Lett. 90, 247401 (2003).

    F. A. Hegmann, R. R. Tykwinski, K. P. H. Lui, J. E. Bullock, and J. E. Anthony, Phys. Rev. Lett. 89, 227403 (2002).

    D. E. Aspnes and A. A. Studna, Phys. Rev. B 27, 985 (1983).

    T.-I. Jeon, K.-J. Kim, C. Kang, S.-J. Oh, J.-H. Son, K. H. An, D. J. Bae, and Y. H. Lee, Appl. Phys. Lett. 80, 3403 (2002)APPLAB000080000018003403000001.

    G. H. Kim, D. A. Ritchie, C.-T. Liang, G. D. Lian, J. Yuan, M. Pepper, and L. M. Brown, Appl. Phys. Lett. 78, 3896 (2001)APPLAB000078000024003896000001.

    J. Urayama, T. B. Norris, H. Jiang, J. Singh, and P. Bhattacharya, Appl. Phys. Lett. 80, 2162 (2002)APPLAB000080000012002162000001.

    P. W. Fry, I. E. Itskevich, S. R. Parnell, J. J. Finley, L. R. Wilson, K. L. Schumacher, D. J. Mowbray, M. S. Skolnick, M. Al-Khafaji, A. G. Cullis, M. Hopkinson, J. C. Clark, and G. Hill, Phys. Rev. B 62, 16784 (2000).

    E. C. Le Ru, J. Fack, and R. Murray, Phys. Rev. B 67, 245318 (2003).


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