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Phys. Rev. Lett. 91, 177401 (2003) [4 pages]

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

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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

Received 31 May 2003; published 20 October 2003

See accompanying Physics Focus

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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.177401
DOI:
10.1103/PhysRevLett.91.177401
PACS:
78.55.Cr, 71.35.–y, 78.67.Hc

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

 
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