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

David Cooke, Yu. I. Mazur, W. Q. Ma, X. Wang, Z. M. Wang, G. J. Salamo, M. Xiao, T. D. Mishima, M. B. Johnson

Research output: Contribution to journalJournal articleResearch

Abstract

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. (C) 2004 American Institute of Physics.
Original languageEnglish
JournalApplied Physics Letters
Volume85
Issue number17
Pages (from-to)3839-3841
ISSN0003-6951
DOIs
Publication statusPublished - 2004
Externally publishedYes

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