標題: Resonant ultrafast nonlinear optics of bulk semiconductors under electric-field modulation
作者: Lai, CM
Meng, HF
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 15-五月-1998
摘要: 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.
URI: http://hdl.handle.net/11536/32622
ISSN: 0163-1829
期刊: PHYSICAL REVIEW B
Volume: 57
Issue: 20
起始頁: 12890
結束頁: 12897
顯示於類別:期刊論文