FAR-INFRARED SATURATION SPECTROSCOPY OF A SINGLE SQUARE-WELL

Authors
CRAIG K FELIX CL HEYMAN JN MARKELZ AG SHERWIN MS CAMPMAN KL HOPKINS PF GOSSARD AC
Citation
K. Craig et al., FAR-INFRARED SATURATION SPECTROSCOPY OF A SINGLE SQUARE-WELL, Semiconductor science and technology, 9(5), 1994, pp. 627-629
Citations number
6
Categorie Soggetti
Engineering, Eletrical & Electronic","Physics, Condensed Matter","Material Science
Journal title
Semiconductor science and technology → ACNP
ISSN journal
02681242
Volume
9
Issue
5
Year of publication
1994
Supplement
S
Pages
627 - 629
Database
ISI
SICI code
0268-1242(1994)9:5<627:FSSOAS>2.0.ZU;2-N
Abstract
We have performed saturation spectroscopy measurements of the lowest i ntersubband transition in a single 400 angstrom GaAs/Al0.3Ga0.7As modu lation-doped square quantum well. We couple intense tunable far-infrar ed radiation from the Santa Barbara free electron laser into our sampl e using an edge-coupling technique and measure absorption as a functio n of frequency and intensity. Saturation and frequency shifts in the a bsorption line are clearly observed. We attribute the frequency shifts to reductions in the many-body depolarization shift. From our prelimi nary measurements, we estimate the intersubband relaxation time to be 600 ps to within a factor of three.