𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Multiphoton absorption in direct gap solids

✍ Scribed by S. S. Mitra; A. Vaidyanathan

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
611 KB
Volume
10
Category
Article
ISSN
0377-0486

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The two photon absorption coefficient for several alkali halides and zincblende type semiconductors has been calculated by models developed by Keldysh, Braunstein and Basov. It is shown that the Keldysh formula is closely related to Braunstein's for allowed‐allowed transitions, while Basov's formula correspond to Braunstein's formula for allowed‐forbidden transitions. A number of inprovements and corrections are pointed out. However, comparison with published experimental data show that even the best calculated values are at least an order of magnitude smaller. A more realistic model that combines the elements of second order perturbation theory and band structure calculations gives excellent agreement with experimental data on several direct gap semiconductors. The three photon absorption coefficient is treated by a third order perturbation method and compared to the results obtained by the Keldysh model.

πŸ“œ SIMILAR VOLUMES

Gauges and fluxes in multiphoton absorpt
Gauges and fluxes in multiphoton absorption by H2+
✍ R. Lefebvre; O. Atabek πŸ“‚ Article πŸ“… 1997 πŸ› John Wiley and Sons 🌐 English βš– 228 KB

q ## Ε½ Multiphoton absorption by H is studied in the various representations from length 2 . gauge to space-translated frame which can be associated to nuclear motion in a two-electronic state description. It is shown that the transformation from length gauge to velocity gauge is equivalent, in t

Excitons in direct band gap cubic semico
Excitons in direct band gap cubic semiconductors
✍ Hoang Ngoc Cam; Nguyen Van Hieu; Nguyen Ai Viet πŸ“‚ Article πŸ“… 1985 πŸ› Elsevier Science 🌐 English βš– 635 KB

## Perturbation is applied to study of the Wannier-Mott excitons in direct band gap cubic semiconductors with a fourfold degenerate highest valence band. The tine structure of exciton energy levels is investigated. General formulae are derived for the matrix elements of the perturbation. From th