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Direct evidence for R- rotons having antiparallel momentum and velocity

Tucker1, Wyatt

  • 1School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK.

Science (New York, N.Y.)
|February 19, 1999
PubMed
Summary

The momentum of R-rotons in liquid helium-4 is antiparallel to their velocity. This was experimentally confirmed using ballistic R-rotons and observing backward refraction in quantum evaporation.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Fluids
  • Low-Temperature Physics

Background:

  • R-rotons are particle-like excitations in superfluid helium-4.
  • Their dispersion relation suggests antiparallel momentum and velocity.
  • Experimental verification was previously limited by the lack of suitable R-roton sources.

Purpose of the Study:

  • To experimentally verify the antiparallel relationship between R-roton momentum and velocity.
  • To investigate the properties of ballistic R-rotons.
  • To demonstrate the utility of quantum evaporation for studying quasiparticle dynamics.

Main Methods:

  • Generation of a source of ballistic R-rotons.
  • Utilizing the quantum evaporation process.
  • Observing the refraction of R-rotons at interfaces.

Main Results:

  • Experimental evidence confirms that R-roton momentum is antiparallel to its velocity.
  • Backward refraction of the quantum evaporation process was observed.
  • This observation serves as a signature for the antiparallel momentum-velocity relationship.

Conclusions:

  • The study provides direct experimental validation of the predicted R-roton behavior.
  • Ballistic R-rotons are a viable tool for probing fundamental properties of quantum fluids.
  • Quantum evaporation is a powerful technique for studying quasiparticle dynamics in superfluid helium-4.

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