ISSN:
0392-6737
Schlagwort(e):
Optical transient phenomena (including quantum beats, dephasings and revivals, photon echoes, free induction decay, and optical mutation)
;
Excitons and related phenomena (including electron-hole drops)
;
Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds)
;
Weak localization effects (e.g., quantized states)
;
Conference proceedings
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Summary The optical properties of multiple quantum wells in the transition from isolated wells to a superlattice are investigated theoretically and experimentally. For superlattices with a miniband width similar to the binding energy of the 2s exciton of the isolated quantum well we find an exciton state energetically between the 1s exciton state and the onset of the miniband absorption. We find this state to be an interwell exciton, with the electron confined to one well and the hole to the neighboring well. The interwell exciton resembles the first Wannier-Stark localized exciton of a biased superlattice. However, the localization in the present case is mediated by the Coulomb interaction of the electron and hole. The state has considerable oscillator strength and is observed experimentally in linear and nonlinear experiments.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02457210
Permalink
