Journal article

Phonon generation in condensed ⁴He by laser-excited atomic bubbles

  • Moroshkin, Peter Department of Physics, University of Fribourg, Switzerland
  • Lebedev, Victor Department of Physics, University of Fribourg, Switzerland
  • Weis, Antoine Department of Physics, University of Fribourg, Switzerland
    16.09.2011
Published in:
  • Europhysics Letters. - 2011, vol. 96, no. 2, p. 26002
English We discuss the interaction between nanometer-sized defects (atomic bubbles) and elementary excitations (phonons) in quantum fluids and solids. We observe that optical excitations in embedded metal atoms induce bubble expansions/contractions that create strongly localized phonon wave packets in the quantum matrix. We derive the structure and dynamics of these vibronic excitations from the experimental laser-induced fluorescence spectra of Au and Cu atoms in liquid and solid He. The atomic vibrations are found to be strongly damped on the 50 Å and 5 ps scales in agreement with pure hydrodynamic estimations.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/302174
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