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Effect of lattice anharmonicity on high-amplitude phonon dynamics in photoexcited bismuth

É. D. Murray, D. M. Fritz, J. K. Wahlstrand, S. Fahy, and D. A. Reis
Phys. Rev. B 72, 060301(R) – Published 29 August 2005

Abstract

Separate theoretical and experimental investigations of the effect of lattice anharmonicity on the A1g phonon dynamics in photoexcited bismuth are presented. First-principles density functional calculations show that the anharmonic contribution to the phonon period is negligible for an excitation of 1.25% or less of the valence electrons, corresponding to electronic frequency softening from 2.9to2.3THz. Experiments using optical double-pump-probe excitation of coherent phonon motion clearly separate the role of lattice anharmonicity from electron-hole plasma and other dynamics, confirming that the effect of anharmonicity on the phonon period is much smaller than the observed softening.

    • Received 22 June 2005

    DOI:https://doi.org/10.1103/PhysRevB.72.060301

    ©2005 American Physical Society

    Authors & Affiliations

    É. D. Murray1, D. M. Fritz2, J. K. Wahlstrand2, S. Fahy1,2, and D. A. Reis2

    • 1Department of Physics and Tyndall National Institute, University College, Cork, Ireland
    • 2FOCUS Center, Department of Physics, and Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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    Issue

    Vol. 72, Iss. 6 — 1 August 2005

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