Excitonic effects on the two-color coherent control of interband transitions in bulk semiconductors
| dc.creator | Bhat, R. D. R. | |
| dc.creator | Sipe, J. E. | |
| dc.date | 2005-06-15 | |
| dc.date.accessioned | 2026-07-07T03:05:38Z | |
| dc.date.available | 2026-07-07T03:05:38Z | |
| dc.description | Quantum interference between one- and two-photon absorption pathways allows coherent control of interband transitions in unbiased bulk semiconductors; carrier population, carrier spin polarization, photocurrent injection, and spin current injection may all be controlled. We extend the theory of these processes to include the electron-hole interaction. Our focus is on photon energies that excite carriers above the band edge, but close enough to it so that transition amplitudes based on low order expansions in $\mathbf{k}$ are applicable; both allowed-allowed and allowed-forbidden two-photon transition amplitudes are included. Analytic solutions are obtained using the effective mass theory of Wannier excitons; degenerate bands are accounted for, but envelope-hole coupling is neglected. We find a Coulomb enhancement of two-color coherent control process, and relate it to the Coulomb enhancements of one- and two-photon absorption. In addition, we find a frequency dependent phase shift in the dependence of photocurrent and spin current on the optical phases. The phase shift decreases monotonically from $π/2$ at the band edge to 0 over an energy range governed by the exciton binding energy. It is the difference between the partial wave phase shifts of the electron-hole envelope function reached by one- and two-photon pathways. | |
| dc.description | 31 pages, 4 figures, to be published in Phys. Rev. B | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0506376 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0506376 | |
| dc.identifier | Phys. Rev. B 72, 075205 (2005) (14 pages) | |
| dc.identifier | doi:10.1103/PhysRevB.72.075205 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/26521 | |
| dc.subject | Other Condensed Matter | |
| dc.title | Excitonic effects on the two-color coherent control of interband transitions in bulk semiconductors | |
| dc.type | text |