H. Ham et Hn. Spector, Exciton linewidth due to scattering by polar optical phonons in semiconducting cylindrical quantum wire structures, PHYS REV B, 62(20), 2000, pp. 13599-13603
The exciton linewidth has been calculated in semiconducting cylindrical qua
ntum wire structures as a function of the radius of the wire when the elect
ron-hole pair which are bound into the exciton are scattered by polar optic
al phonons. Because in quantum wells, we found that the dominant contributi
ons to the Linewidth come from processes where the exciton is scattered in
its ground state with a change in its center of mass motion and where the e
xciton is ionized into a free electron-hole pair by the polar optical phono
ns, we only consider such processes here. The linewidth for this scattering
mechanism is found to increase as the radius of the wire decreases. Theref
ore, confinement of the exciton in a quantum wire structure will increase t
he linewidth of the exciton peaks when the exciton is scattered by polar op
tical phonons. As in the case of quantum wells for this scattering mechanis
m, the contribution to the linewidth from the inelastic scattering is large
r than the contribution from the elastic scattering.