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
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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 et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 28318
- DOI 10.1209/0295-5075/96/26002
- Persistent URL
- https://folia.unifr.ch/unifr/documents/302174
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