Resonant ultrafast nonlinear optics of bulk semiconductors under electric-field modulation

Chih Ming Lai, Hsin-Fei Meng

Research output: Contribution to journalArticle

1 Scopus citations


In bulk direct-band-gap semiconductors the ground state of a (photoexcited) electron-hole system is normally an exciton gas, instead of an electron-hole plasma, as long as the carrier density is not too large. We demonstrate theoretically that, in the presence of an electric-field modulation, the energy of the plasma is decreased due to the induced charge-density fluctuation. As a results, the plasma becomes the ground state at much lower carrier densities, implying that the critical carrier density for the transition between these two states can be reduced. This transition provides a mechanism of nonlinear optics for bulk direct-band-gap semiconductors with picosecond relaxation time, large nonlinearity, and low pump intensity.

Original languageEnglish
Pages (from-to)12890-12897
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number20
StatePublished - 1 Jan 1998

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