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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
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Phonon Hall Viscosity of Ionic Crystals.
1Department of Physics, Boston College, 140 Commonwealth Avenue Chestnut Hill, Massachusetts 02467, USA.
Physical Review Letters
|December 22, 2023
Summary
In ionic crystals, Lorentz forces on moving ions generate a phonon Hall viscosity, a dissipationless component of viscosity. This study quantifies this contribution in a lattice model, comparing it to other mechanisms.
Area of Science:
- Condensed matter physics
- Acoustic lattice dynamics
Background:
- Time-reversal symmetry breaking in lattice dynamics allows for a dissipationless viscosity component, the phonon Hall viscosity.
- Phonon Hall viscosity describes the growth of phonon chirality with wave vector.
Purpose of the Study:
- To demonstrate that Lorentz forces on moving ions in ionic crystals contribute to phonon Hall viscosity.
- To calculate the magnitude of this Lorentz force contribution using a model system.
Main Methods:
- Theoretical calculation of phonon Hall viscosity contribution from Lorentz forces.
- Utilizing a simple square lattice toy model for ionic crystals.
- Comparison with existing literature values for other Hall viscosity mechanisms.
Main Results:
- Lorentz forces on ions in ionic crystals are identified as a source of phonon Hall viscosity.
- Quantitative estimates of the Lorentz force contribution were obtained using the square lattice model.
Conclusions:
- The Lorentz force mechanism provides a significant contribution to phonon Hall viscosity in ionic crystals.
- This finding offers a deeper understanding of dissipationless transport in phononic systems.
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