Influence of pulse width and detuning on coherent phonon generation

Kazutaka G. Nakamura, Yutaka Shikano, and Yosuke Kayanuma
Phys. Rev. B 92, 144304 – Published 6 October 2015

Abstract

We investigated the coherent phonon generation mechanism by irradiation of an ultrashort pulse with a simple two-level model. Our derived formulation shows that both impulsive stimulated Raman scattering (ISRS) and impulsive absorption (IA) simultaneously occur, and phonon wave packets are generated in the electronic ground and excited states by ISRS and IA, respectively. We identify the dominant process from the amplitude of the phonon oscillation. For short pulse widths, ISRS is very small and becomes larger as the pulse width increases. We also show that the initial phase is dependent on the pulse width and the detuning.

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  • Received 27 July 2015
  • Revised 14 September 2015

DOI:https://doi.org/10.1103/PhysRevB.92.144304

©2015 American Physical Society

Authors & Affiliations

Kazutaka G. Nakamura1,2,3,*, Yutaka Shikano1,4,5,†, and Yosuke Kayanuma1,3,6,‡

  • 1Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
  • 2Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
  • 3CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
  • 4Research Center of Integrative Molecular Systems, Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki, Aichi 444-8585, Japan
  • 5Institute for Quantum Studies, Chapman University, 1 University Drive, Orange, California 92866, USA
  • 6Graduate School of Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka, 599-8531 Japan

  • *nakamura@msl.titech.ac.jp
  • yshikano@ims.ac.jp
  • kayanuma.y.aa@m.titech.ac.jp

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Issue

Vol. 92, Iss. 14 — 1 October 2015

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