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Excitation of Coherent Phonons in Crystalline Bi: Theory for Driving Atomic Vibrations by Femtosecond Pulses

Published online by Cambridge University Press:  01 February 2011

Davide Boschetto ,
Eugene G. Gamaly ,
Andrei V. Rode ,
Thomas Garl  and
Antoine Rousse
Davide Boschetto
Affiliation:
davide.boschetto@ensta.fr, ENSTA, Laboratoire d'Optique Applique, Chemin de la Hunire, Palaiseau, 91761, France
Eugene G. Gamaly
Affiliation:
gam111@rsphy1.anu.edu.au, The Australian National University, Laser Physics Centre, Research School of Physical Sciences and Engineering, Canberra, ACT 0200, Australia
Andrei V. Rode
Affiliation:
avr111@rsphy1.anu.edu.au, The Australian National University, Laser Physics Centre, Research School of Physical Sciences and Engineering, Canberra, ACT 0200, Australia
Thomas Garl
Affiliation:
avr111@rsphysse.anu.edu.au, The Australian National University, Laser Physics Centre, RSPhysSE, Laser Physics Centre, RSPhysSE, Oliphant Building 60, The Australian National University, Canberra, 0200, Australia, +61 2 6125 4637
Antoine Rousse
Affiliation:
antoine.rousse@ensta.fr, ENSTA, Laboratoire d'Optique Applique, Chemin de la Hunire, Palaiseau, 91761, France
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Abstract

In this paper we show time-resolved experiment with 35 fs resolution on bismuth single crystal, for which very high sensitivity detection system has been used. Coherent and incoherent lattice dynamics as well as electrons dynamics can be clearly seen into the reflectivity changes. The complex behaviour of the reflectivity could not be explained in the light of the existing theories. Therefore, we developed a new theory, starting from the very basic principle of laser-matter interaction, which is in good agreement with experimental results. Two main results will be shown: the coherent phonon is excited by the temperature gradient; the changes in reflectivity are related directly to the changes in electron-phonon collision frequency.

Keywords

optical propertieselectron-phonon interactionsBi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1016: Symposium CC – Materials and Material Structures Enabling Terahertz Technology , 2007 , 1016-CC06-03
Copyright
Copyright © Materials Research Society 2007

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