Beitrag in einem Tagungsband
Ab-initio study of coherent phonons excited by femtosecond laser pulses in Bismuth
Details zur Publikation
Autor(inn)en: | Garcia, M. |
Herausgeber: | Claude R. Phipps |
Verlag: | SPIE |
Verlagsort / Veröffentlichungsort: | Taos, NM, USA |
Publikationsjahr: | 2006 |
Zeitschrift: | Proceedings of SPIE |
Seitenbereich: | 62610R |
Buchtitel: | Proceedings Volume 6261 |
Titel der Buchreihe: | High-Power Laser Ablation |
Bandnr.: | VI |
Jahrgang/Band : | 6261 |
Seitenumfang: | 6 |
ISSN: | 0277-786X |
DOI-Link der Erstveröffentlichung: |
Zusammenfassung, 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.
Schlagwörter
phase transitions