Title :
Biexponential decoherence in photon echoes: spectral evidence for nearly degenerate localized excitons
Author :
Erland, J. ; Kim, J.C. ; Gammon, D. ; Steel, D.G.
Author_Institution :
Randall Lab. of Phys., Michigan Univ., Ann Arbor, MI, USA
Abstract :
Summary form only given.Much recent progress has been made in the understanding of the optical response of low dimensional semiconductors. However, additional complications of strong localization and their effects on dynamics and the coherent optical response remain unresolved. Using a highly disordered GaAs single quantum well (width 42 /spl Aring/), we report the nonlinear signal in a self-diffracted transient four-wave mixing (FWM) experiment extending over more than three decades in amplitude as a function of pulse delay.
Keywords :
gallium arsenide; high-speed optical techniques; light coherence; light diffraction; multiwave mixing; photon echo; semiconductor quantum wells; time resolved spectra; 42 A; GaAs; biexponential decoherence; coherent optical response; dynamics; highly disordered GaAs single quantum well; low dimensional semiconductors; nearly degenerate localized excitons; nonlinear signal; optical response; photon echoes; pulse delay; self-diffracted transient four-wave mixing; spectral evidence; strong localization; Delay; Excitons; Gallium arsenide; Laser beams; Laser modes; Optical pulse generation; Optical pulse shaping; Pulse measurements; Quantum well devices; Temperature;
Conference_Titel :
Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-541-2
DOI :
10.1109/IQEC.1998.680423
