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Near-Field Optical Mapping of Exciton Wave Functions in a GaAs Quantum Dot

K. Matsuda, T. Saiki, S. Nomura, M. Mihara, Y. Aoyagi, S. Nair, and T. Takagahara
Phys. Rev. Lett. 91, 177401 – Published 20 October 2003
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Abstract

Near-field photoluminescence imaging spectroscopy of naturally occurring GaAs quantum dots (QDs) is presented. We successfully mapped out center-of -mass wave functions of an exciton confined in a GaAs QD in real space due to the enhancement of spatial resolution up to 30 nm. As a consequence, we discovered that the spatial profile of the exciton emission, which reflects the shape of a monolayer-high island, differs from that of biexciton emission, due to different distributions of the polarization field for the exciton and biexciton recombinations. This novel technique can be extensively applied to wave function engineering in the design and the fabrication of quantum devices.

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  • Received 31 May 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.177401

©2003 American Physical Society

Authors & Affiliations

K. Matsuda1,2,*, T. Saiki1,3, S. Nomura4,5, M. Mihara5, Y. Aoyagi5,6, S. Nair7, and T. Takagahara8

  • 1Kanagawa Academy of Science and Technology, 3-2-1 Sakado, Takatsu, Kawasaki, Japan
  • 2Nanostructure and Material Property, PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama, Japan
  • 3Department of Electronics and Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku, Yokohama, Kanagawa, Japan
  • 4Institute of Physics, University of Tsukuba, 1-1-1 Tsukuba, Ibaraki, Japan
  • 5Semiconductors Laboratory, The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama, Japan
  • 6Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuda, Midori, Yokohama, Japan
  • 7Center for Advanced Nanotechnology, University of Toronto, 170 College Street, Toronto, Ontario M5S 3E3, Canada
  • 8Department of Electronics and Information Science, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto, Japan

  • *Electronic address: matsuda@net.ksp.or.jp

See Also

The Travels of An Exciton

Kim Krieger
Phys. Rev. Focus 12, 15 (2003)

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Issue

Vol. 91, Iss. 17 — 24 October 2003

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