Laser spectroscopy of phonons and rotons in superfluid helium doped with Dy atoms

P. Moroshkin*, A. Borel, Kimitoshi Kono

*Corresponding author for this work

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Abstract

We report the results of a high-resolution laser-spectroscopy study of dysprosium atoms injected into superfluid He-4. A special attention is paid to the transitions between the inner 4f and 5d electronic shells of Dy. The characteristic gap is observed between the zero-phonon line and the phonon wing in the experimental excitation spectrum that arises due to the peculiar structure of the phonon-roton spectrum of superfluid He. This observation resolves the longstanding discrepancy between the studies of bulk superfluid He and He nanodroplets.

Original languageEnglish
Article number094504
Number of pages6
JournalPhysical Review B
Volume97
Issue number9
DOIs
StatePublished - 9 Mar 2018

Keywords

  • LIQUID-HELIUM
  • LANTHANIDE ATOMS
  • DROPLETS
  • EXCITATIONS
  • LINES
  • ABSORPTION
  • MOLECULES
  • PRESSURE
  • SPECTRA
  • HE-4

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