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 |
DOI-Link der Erstveröffentlichung: |
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.
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
