Forbidden Band‐Edge Excitons of Wurtzite‐GaP: A Theoretical View

Authors:
Publisher website
Google Scholar
Abstract
By means of an approximate quasiparticle description we study the electronic structure of wurtzite‐GaP in more detail for the two lowest and conduction bands and the three highest , , and valence bands. We conclude that the corresponding three gaps between the valence bands and the conduction band are quasi‐direct, while the ones involving the s‐like conduction band are direct. The optical oscillator strengths are also calculated outside the point. Their influence on the observability of excitons in absorption and emission spectra is investigated. The almost dipole‐forbidden transitions into the lowest p‐like conduction band become substantial for finite wave vectors perpendicular to the c‐axis. Therefore, the finite extent of the exciton envelope functions gives rise to non‐vanishing transition strengths, which explain the intense photoluminescence observed experimentally by forbidden p‐type excitons.
Funding Information
  • European Commission (735008)

This publication has 36 references indexed in Scilit: