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Quantum pathways of carrier and coherent phonon excitation in bismuth

Azize Koç, Isabel Gonzalez-Vallejo, Matthias Runge, Ahmed Ghalgaoui, Klaus Reimann, Laurenz Kremeyer, Fabian Thiemann, Michael Horn-von Hoegen, Klaus Sokolowski-Tinten, Michael Woerner, and Thomas Elsaesser
Phys. Rev. B 107, L180303 – Published 23 May 2023
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Abstract

Quantum pathways inducing coherent lattice dynamics are studied in bismuth (Bi). A crystalline Bi film is excited by femtosecond midinfrared pulses and transient intensity changes on the (111) Bragg reflection are probed by hard x-ray pulses. A fast decrease and coherent oscillations of the diffracted intensity display up to 50% and 10% intensity change, respectively. The oscillation frequency of 2.6 THz is independent of pump intensity. Midinfrared excitation opens different quantum pathways for electron-hole generation, such as field-driven carrier tunneling at the L points, which reduces the crystal symmetry and leads to optical phonon excitation at the X point with the strongest electron-phonon coupling.

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  • Received 29 July 2022
  • Revised 20 October 2022
  • Accepted 9 May 2023

DOI:https://doi.org/10.1103/PhysRevB.107.L180303

©2023 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Azize Koç1, Isabel Gonzalez-Vallejo1, Matthias Runge1, Ahmed Ghalgaoui1, Klaus Reimann1, Laurenz Kremeyer2,*, Fabian Thiemann2, Michael Horn-von Hoegen2, Klaus Sokolowski-Tinten2, Michael Woerner1,†, and Thomas Elsaesser1

  • 1Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2A, 12489 Berlin, Germany
  • 2Department of Physics and Center for Nanointegration CENIDE, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany

  • *Present address: Department of Physics, Center for the Physics of Materials, McGill University, Montreal, Canada.
  • woerner@mbi-berlin.de

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Issue

Vol. 107, Iss. 18 — 1 May 2023

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