Fermi-energy-edge singularity in quantum wells containing more than one occupied subband

M. S. Skolnick; D. M. Whittaker; P. E. Simmonds; T. A. Fisher; M. K. Saker; J. M. Rorison; R. S. Smith; P. B. Kirby; C. R. H. White

doi:10.1103/PhysRevB.43.7354

Rapid Communication

Fermi-energy-edge singularity in quantum wells containing more than one occupied subband

M. S. Skolnick, D. M. Whittaker, P. E. Simmonds, T. A. Fisher, M. K. Saker, J. M. Rorison, R. S. Smith, P. B. Kirby, and C. R. H. White

Phys. Rev. B 43, 7354(R) – Published 15 March 1991

Abstract

A study of the Fermi-energy-edge singularity in asymmetric modulation-doped quantum wells is reported. It is shown that high densities of free carriers in filled n=1 electron subbands have no significant influence on the edge singularity in partly occupied n=2 subbands, demonstrating the weakness of intersubband Coulomb-scattering processes. The enhancement of oscillator strength at the Fermi energy is of very similar magnitude to that for excitonic transitions in undoped quantum wells.

Received 10 December 1990

DOI:https://doi.org/10.1103/PhysRevB.43.7354

Authors & Affiliations

M. S. Skolnick and D. M. Whittaker

Royal Signals and Radar Establishment, St. Andrews Road, Malvern, Worcester WR14 3PS, United Kingdom

P. E. Simmonds

Royal Signals and Radar Establishment, St. Andrews Road, Malvern, Worcester WR14 3PS, United Kingdom
Department of Physics, University of Wollongong, Wollongong, New South Wales, 2500 Australia

T. A. Fisher