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  • Letter

Effect of diffusion on acoustic deformation potential characterization through coherent acoustic phonon dynamics

Long Li1,2,*, Feng He3,*, Xu Zhao3, Zhen Tong4,5, and Liang Guo1,6,†

  • 1Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
  • 2School of Microelectronics, Shenzhen Institute of Information Technology, Shenzhen 518172, China
  • 3State Key Laboratory on Tunable Laser Technology, School of Electronics and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
  • 4Shenzhen JL Computational Science and Applied Research Institute, Shenzhen 518131, China
  • 5Beijing Computational Science Research Center, Beijing 100193, China
  • 6Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology), Ministry of Education, Shenzhen 518055, China

  • *These authors contributed equally to this work.
  • †guol3@sustech.edu.cn
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Phys. Rev. B 106, L060304 – Published 24 August, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L060304

Abstract

Ultrafast spectroscopy of coherent acoustic phonon (CAP) dynamics has recently been proposed as a method to characterize acoustic deformation potential (ADP), a key standard to quantify carrier–acoustic phonon coupling in semiconductors. In this Letter, we illustrate the importance of addressing the diffusion effect in ADP characterization by this method, using Ge as the demonstration system. It is found that the ADP mechanism and the thermoelastic effect have comparable contributions to CAP generation in Ge. Due to the different dependences on pump photon energies, the roles of these two mechanisms were assessed by varying pump wavelengths, based on which the ADP coupling constant of Ge was obtained. The analysis reveals that the carrier diffusion has a considerable impact on the shape of the CAP wave packet and must be processed cautiously for the ADP characterization for Ge.

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Phys. Rev. B 106, L060304– Published 24 August, 2022
  • Received 18 March 2022
  • Revised 28 July 2022
  • Accepted 10 August 2022
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