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Related Experiment Videos

Phenomenological evidence for the phonon Hall effect.

C Strohm1, G L J A Rikken, P Wyder

  • 1Grenoble High Magnetic Field Laboratory, MPI-FKF/CNRS, BP 169, 38042 Grenoble Cedex 9, France.

Physical Review Letters
|October 26, 2005
PubMed
Summary

Researchers demonstrate the phonon Hall effect, a novel thermal phenomenon analogous to the electrical Hall effect, in the material Tb3Ga5O12. This discovery challenges previous assumptions about heat transport in materials lacking charge carriers.

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Area of Science:

  • Condensed Matter Physics
  • Solid State Physics
  • Materials Science

Background:

  • The electrical Hall effect involves a transverse voltage induced by a magnetic field acting on electrical current via Lorentz force.
  • It's widely believed that a similar effect is impossible for phonons (heat carriers) due to the absence of charge transport.
  • This assumption has limited the exploration of transverse thermal transport phenomena.

Purpose of the Study:

  • To theoretically propose and experimentally verify the existence of a phonon Hall effect.
  • To demonstrate that transverse thermal conductivity effects can occur without charge carriers.
  • To challenge the conventional understanding of heat transport under magnetic fields.

Main Methods:

  • Theoretical analysis of phonon transport under magnetic fields.

Related Experiment Videos

  • Experimental measurement of thermal conductivity in a specific material under applied magnetic fields.
  • Utilizing Tb3Ga5O12 (terbium gallium garnet) as the experimental sample.

    • Main Results:

    • Experimental evidence confirming a transverse thermal conductivity response analogous to the Hall effect.
    • Demonstration of the phonon Hall effect in Tb3Ga5O12.
    • Observation of a measurable thermal Hall signal attributed to phonon behavior.

    Conclusions:

    • The phonon Hall effect is a real physical phenomenon.
    • This effect can occur in materials even without electrical charge transport.
    • The findings open new avenues for controlling and understanding heat transport in solids.