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

Eeuwe S. Zijlstra; Larisa L. Tatarinova; Martin E Garcia

doi:10.1117/12.674387

7 June 2006 Ab-initio study of coherent phonons excited by femtosecond laser pulses in Bismuth

Eeuwe S. Zijlstra, Larisa L. Tatarinova, Martin E Garcia

Proceedings Volume 6261, High-Power Laser Ablation VI; 62610R (2006) https://doi.org/10.1117/12.674387
Event: High-Power Laser Ablation 2006, 2006, Taos, NM, United States

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.

Citation Download Citation

Eeuwe S. Zijlstra, Larisa L. Tatarinova, and Martin E Garcia "Ab-initio study of coherent phonons excited by femtosecond laser pulses in Bismuth", Proc. SPIE 6261, High-Power Laser Ablation VI, 62610R (7 June 2006); https://doi.org/10.1117/12.674387

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