Conference proceedings article
Ab-initio study of coherent phonons excited by femtosecond laser pulses in Bismuth



Publication Details
Authors:
Garcia, M.
Editor:
Claude R. Phipps
Publisher:
SPIE
Place:
Taos, NM, USA
Publication year:
2006
Journal:
Proceedings of SPIE
Pages range:
62610R
Book title:
Proceedings Volume 6261
Title of series:
High-Power Laser Ablation
Number in series:
VI
Volume number:
6261
Number of pages:
6
ISSN:
0277-786X

Abstract
Using the Born-Oppenheimer approximation we calculate potential energy surfaces of photoexcited Bismuth-bulk. We determine phonon frequencies and potential anharmonicities for the case of high density of excited carriers. In particular, we focus on the phonon modes A(1g) and E-g. We find strong softening of the A(1g)-frequency for increasing excited carrier density. Furthermore, from the analysis of the lattice motion upon excitation we show that there is a coupling between the A(1g) and E-g modes, which is consistent with recent experimental findings.


Keywords
phase transitions


Authors/Editors

Last updated on 2019-11-04 at 14:31