Femtosecond Formation of Coupled Phonon-Plasmon Modes in InP: Ultrabroadband THz Experiment and Quantum Kinetic Theory

R. Huber, C. Kübler, S. Tübel, A. Leitenstorfer, Q. T. Vu, H. Haug, F. Köhler, and M.-C. Amann
Phys. Rev. Lett. 94, 027401 – Published 19 January 2005

Abstract

The ultrafast transition of an optical phonon resonance to a coupled phonon-plasmon system is studied. After 10-fs photoexcitation of i-InP, the buildup of coherent beats of the emerging hybrid modes is directly monitored via ultrabroadband THz spectroscopy. The anticrossing is mapped out as a function of time and density. A quantum kinetic theory of microscopic carrier-carrier and carrier-LO-phonon interactions explains the delayed formation of the collective modes. The buildup time is quantitatively reproduced to scale with the oscillation cycle of the upper branch of the coupled resonance.

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  • Received 24 May 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.027401

©2005 American Physical Society

Authors & Affiliations

R. Huber1,*, C. Kübler2, S. Tübel1, A. Leitenstorfer2, Q. T. Vu3, H. Haug3, F. Köhler4, and M.-C. Amann4

  • 1Physik-Department E11, Technische Universität München, D-85748 Garching, Germany
  • 2Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
  • 3Institut für Theoretische Physik, Universität Frankfurt, D-60054 Frankfurt a.M., Germany
  • 4Walter Schottky Institut (E26), Technische Universität München, D-85748 Garching, Germany

  • *Corresponding author. Email address: ruhub@ph.tum.de

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Vol. 94, Iss. 2 — 21 January 2005

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