Interband collective electronic excitations in resonant Raman scattering of two-subband quantum wires |
| |
Authors: | M Sassetti F Napoli B Kramer |
| |
Institution: | 1. Dipartimento di Fisica, INFM, Università di Genova, Via Dodecaneso 33, 16146, Genova, Italy 2. I. Institut für Theoretische Physik, Universit?t Hamburg, Jungiusstra?e 9, 20355, Hamburg, Germany
|
| |
Abstract: | Using the bosonization technique, a theory for the collective excitations of the interacting electrons in quantum wires with
two subbands occupied is developed. The dispersion relations for the inter-subband charge and spin density excitations are
determined. The results are used to interpret the features observed in recent measurements of the Raman spectra of AlGaAs/GaAs
quantum wires, particularly for photon energies near band gap resonance. It is shown that peaks previously identified as “single
particle excitations” are signatures of higher order collective spin density excitations. Predictions about the observability
of the interband modes are made.
Received 8 February 1999 |
| |
Keywords: | PACS 71 45 -d Collective effects - 78 30 -j Infrared and Raman spectra - 73 20 Dx Electron states in low-dimensional structures (superlattices quantum well structures and multilayers) |
本文献已被 SpringerLink 等数据库收录! |
|