Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
4-WAVE-MIXING THEORY BEYOND THE SEMICONDUCTOR BLOCH EQUATIONS
Autore:
AXT VM; STAHL A; MAYER EJ; BOLIVAR PH; NUSSE S; PLOOG K; KOHLER K;
Indirizzi:
RHEIN WESTFAL TH AACHEN,INST THEORET PHYS B,PHYS ZENTRUM SOMMERFELDSTR D-52074 AACHEN GERMANY MAX PLANCK INST FESTKORPERFORSCH D-70569 STUTTGART GERMANY PAUL DRUDE INST FESTKORPERELEKTR D-10117 BERLIN GERMANY RHEIN WESTFAL TH AACHEN,INST HALBLEITERTECH 2 D-52074 AACHEN GERMANY FRAUNHOFER INST APPL SOLID STATE PHYS D-79108 FREIBURG GERMANY
Titolo Testata:
Physica status solidi. b, Basic research
fascicolo: 1, volume: 188, anno: 1995,
pagine: 447 - 456
SICI:
0370-1972(1995)188:1<447:4TBTSB>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUANTUM-WELLS; POLARIZATION DEPENDENCE; EXCITONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
V.M. Axt et al., "4-WAVE-MIXING THEORY BEYOND THE SEMICONDUCTOR BLOCH EQUATIONS", Physica status solidi. b, Basic research, 188(1), 1995, pp. 447-456

Abstract

Four-wave-mixing (FWM) experiments using a dynamical density matrix model of the semiconductor band edge are discussed. Higher-order correlation functions are retained which are neglected in the commonly used RPA treatment leading to the semiconductor Bloch equations. In order to terminate the hierarchy of the equations of motion for the higher-order density matrices systematically a truncation scheme controlled by orders in the driving field is applied. For any prescribed order n in the exciting field a closed set of equations is obtained from which the dielectric response up to order n can be calculated exactly. In addition it turns out that in a coherently driven system part of the remaining density matrices become redundant and can be eliminated. Four-wave-mixing experiments are dominated by third-order contributions. Applying the above-described results one ends up with only two functions inthis case. These are the excitonic and the biexcitonic transition densities. As an application of our method the example of a GaAs single quantum well is studied. Two pulses with finite lengths are assumed such that both heavy-acid light-hole excitons are excited. The influence of the biexciton contribution on the polarization properties of the FWM signal is analyzed and compared with experimental results.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:38:03