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Theory of Exciton‐Polaritonic Absorption in Multiple Quantum Wells
Author(s) -
Kosobukin V. A.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199807)208:1<271::aid-pssb271>3.0.co;2-v
Subject(s) - radiative transfer , exciton , molar absorptivity , absorption (acoustics) , photon , physics , biexciton , condensed matter physics , atomic physics , quantum well , quantum mechanics , optics , laser
A theory is presented for electromagnetic energy transfer and absorption mediated by quasi‐two‐dimensional excitons in regular multiple‐quantum‐well (MQW) structures. The absorptivity, absorption coefficient and their integrals over the photon frequency are generally expressed as functions of the ratio between the excitonic non‐radiative and radiative damping rates. The dependences of the integral absorption characteristics on the non‐radiative damping rate Γ of an exciton are found to decrease at small Γ, so do at low temperatures the dependences on temperature due to phonon‐assisted decay of the exciton. Such behaviour of integral absorption versus the non‐radiative damping rate is ascribed to the specific role of radiative exciton decay to be accompanied by photon escape from a finite‐length MQW structure. That manifests itself as a violation of the Bouguer law at weak non‐radiative damping or low temperatures.