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Formation of a high T(c) electron-hole liquid in diamond
Ryo Shimano1, Masaya Nagai, Kenji Horiuch
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.
Abstract:
We report on the observation of electron-hole ( e-h) liquid (EHL) in diamond by time-resolved luminescence measurements under an intense femtosecond photoexcitation above the band gap. The EHL luminescence band is observed below the e-h plasma band, showing a finite rise time of several tens of picoseconds. The rise time, which corresponds to the nucleation and the growth of the e-h droplets, plummets on approaching the EHL critical temperature. Time-resolved spectral shape analysis reveals a very high carrier density of 1x10(20) cm(-3) and very high critical temperature of T(c) = 165 K of EHL.