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Direct creation of excitonic molecules by two-photon absorption in quantum wells

Technical Report:

Abstract

A theory of the direct creation of excitonic molecule (biexciton) by direct two-photon absorption in semiconductor quantum well structures is developed. Analytical expression of the biexciton two-photon absorption coefficient is given for both photon polarizations. Excitonic-interband-two-photon and exciton one-photon processes in Quantum Wells (QW) have also been investigated. The analytical forms and numerical values of the momentum matrix elements involved in each process are provided. The biexciton matrix element has been calculated adopting a six-parameter variational wave function. A numerical estimation for GaAs QW shows that the biexciton two photon absorption (BTPA) process dominates the other processes by different orders of magnitude. This enhancement essentially comes from the resonance effect and the structure of the matrix elements included in each process. Furthermore, the (BTPA) process in QW for both polarizations is enhanced over its bulk value by about 4 and 5 orders of magnitude respectively. This increase is interpreted as due to the spatial confinement of the QW. (author). 16 refs, 4 tabs.
Authors:
Publication Date:
Sep 01, 1992
Product Type:
Technical Report
Report Number:
IC-92/223
Reference Number:
SCA: 664200; 665000; PA: AIX-24:009150; SN: 93000933554
Resource Relation:
Other Information: PBD: Sep 1992
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; GALLIUM ARSENIDES; ENERGY-LEVEL TRANSITIONS; EXCITONS; SEMICONDUCTOR MATERIALS; BAND THEORY; MATRIX ELEMENTS; WAVE FUNCTIONS; 664200; 665000; SPECTRA OF ATOMS AND MOLECULES AND THEIR INTERACTIONS WITH PHOTONS; PHYSICS OF CONDENSED MATTER
OSTI ID:
10119807
Research Organizations:
International Centre for Theoretical Physics (ICTP), Trieste (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE93613552; TRN: XA9233070009150
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[14] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Hassan, A R. Direct creation of excitonic molecules by two-photon absorption in quantum wells. IAEA: N. p., 1992. Web.
Hassan, A R. Direct creation of excitonic molecules by two-photon absorption in quantum wells. IAEA.
Hassan, A R. 1992. "Direct creation of excitonic molecules by two-photon absorption in quantum wells." IAEA.
@misc{etde_10119807,
title = {Direct creation of excitonic molecules by two-photon absorption in quantum wells}
author = {Hassan, A R}
abstractNote = {A theory of the direct creation of excitonic molecule (biexciton) by direct two-photon absorption in semiconductor quantum well structures is developed. Analytical expression of the biexciton two-photon absorption coefficient is given for both photon polarizations. Excitonic-interband-two-photon and exciton one-photon processes in Quantum Wells (QW) have also been investigated. The analytical forms and numerical values of the momentum matrix elements involved in each process are provided. The biexciton matrix element has been calculated adopting a six-parameter variational wave function. A numerical estimation for GaAs QW shows that the biexciton two photon absorption (BTPA) process dominates the other processes by different orders of magnitude. This enhancement essentially comes from the resonance effect and the structure of the matrix elements included in each process. Furthermore, the (BTPA) process in QW for both polarizations is enhanced over its bulk value by about 4 and 5 orders of magnitude respectively. This increase is interpreted as due to the spatial confinement of the QW. (author). 16 refs, 4 tabs.}
place = {IAEA}
year = {1992}
month = {Sep}
}