Dielectric constant of GaAs during a subpicosecond laser-induced phase transition

Autor:	Eli N. Glezer, Eric Mazur, Y. Siegal
Rok vydání:	1994
Předmět:	Phase transition Materials science business.industry Physics::Optics Dielectric Laser Fluence Molecular physics law.invention Crystal law Phase (matter) Femtosecond Optoelectronics business Excitation
Zdroj:	Physical Review B. 49:16403-16406
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.49.16403
Popis:	We measured the time evolution of the real and imaginary parts of the dielectric constant of GaAs following femtosecond laser pulse excitation. The data show a collapse of the average optical gap, or average bonding anti-bonding energy level separation. The rate of collapse increases with pump fluence. The decrease in the gap indicates that the pump beam induces a structural transformation from a covalent, tetrahedrally-coordinated crystal to a phase with metallic cohesive properties.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c929a4bea293e4fa717e489921a63c69 https://doi.org/10.1103/physrevb.49.16403 Zobrazit plný text záznamu