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Phys. Rev. B 68, 081202(R) (2003) [4 pages]

Creation of supercooled exciton gas and transformation to electron-hole droplets in diamond

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Masaya Nagai1,*, Ryo Shimano1,2, Kenji Horiuchi3, and Makoto Kuwata-Gonokami1,2,†
1Department of Applied Physics, The University of Tokyo, and Cooperative Excitation Project ERATO, Japan Science and Technology Corporation (JST), 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2Solution Oriental Research for Science and Technology (SORST), JST, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
3Frontier Laboratory, R&D Planning Department, Tokyo Gas Co., Ltd. 1-7-7, Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan

Received 7 May 2003; published 12 August 2003

We investigated the formation dynamics of electron-hole droplets in a high-purity single crystal diamond under photoexcitation near the band gap using time-resolved emission spectroscopy. Below the exciton Mott transition density, photogenerated carriers are cooled, and exciton emission appears within 30 ps. A broad emission band of droplets rises slowly, accompanied with a reduction in the exciton emission intensity in the next hundred picoseconds. This spectral change indicates the initial formation of low-temperature supersaturated exciton gas and subsequent spatial condensation of dense exciton gas into electron-hole droplets.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.081202
DOI:
10.1103/PhysRevB.68.081202
PACS:
71.35.Ee, 71.30.+h, 71.35.Lk

*Present address: Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

†Author to whom correspondence should be addressed. Email address: gonokami@ap.t.u-tokyo.ac.jp

 
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