Exciton linewidth due to scattering by polar optical phonons in semiconducting cylindrical quantum wire structures

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.