Anisotropic exchange splitting of excitonic levels in small quantum systems

✍ Scribed by S.V. Goupalov; E.L. Ivchenko; A.V. Kavokin

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 79 KB
• Volume: 23
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0367

✦ Synopsis

A theory of long-range exchange interaction between an electron and a hole in a zerodimensional exciton has been developed taking into account the retardation effect. It has been shown that, for the anisotropic localizing potential in bulk semiconductors or semiconductor nanostructures, the long-range interaction leads to a splitting of radiative localized-exciton levels. Polarization of split sublevels is determined by the shape of the exciton envelope function. For excitons localized in quantum wells, typical splitting is expected to be tens of µ eV in agreement with recent experiments.