Eur. Phys. J. B 11, 643-654 (1999)
https://doi.org/10.1007/s100510051193

Interband collective electronic excitations in resonant Raman scattering of two-subband quantum wires

¹ Dipartimento di Fisica, INFM, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
² I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany

Corresponding author: ^a kramer@physnet.uni-hamburg.de

Received: 8 February 1999
Published online: 15 October 1999

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.