Title :
Broadband THz response of a resonantly excited high-density exciton gas
Author :
Huber, Rupert ; Kaindl, Robert A. ; Schmid, Benjamin A. ; Chemla, Daniel S.
Author_Institution :
Dept. of Phys., California Univ., Berkeley, CA, USA
Abstract :
The density-driven crossover of electron-hole pairs from insulating to conducting states is observed via the internal 1s-2p exciton resonance. Decreasing interparticle distance induces strong shifts and broadening, and ultimately the disappearance of the excitonic resonance.
Keywords :
electrical conductivity transitions; excitons; semiconductor quantum wells; submillimetre wave spectra; time resolved spectra; conducting states; density-driven crossover rate; electron-hole pairs; exciton resonance; far infrared spectroscopy; insulating states; internal 1s-2p transition; resonantly excited high-density exciton gas; semiconductor quantum wells; time-resolved THz spectroscopy; Absorption; Delay effects; Excitons; Infrared spectra; Insulation; Optical pumping; Probes; Resonance; Spectroscopy; Ultrafast optics;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2005. QELS '05
Print_ISBN :
1-55752-796-2
DOI :
10.1109/QELS.2005.1548905
