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Chirality-Induced Phonon Dispersion in a Noncentrosymmetric Micropolar Crystal by J. Kishine; A. S. Ovchinnikov; A. A. Tereshchenko is a Physics and Astronomy article available to read on EtoBox.

What is Chirality-Induced Phonon Dispersion in a Noncentrosymmetric Micropolar Crystal about?

Features of the phonon spectrum of a chiral crystal are examined within the micropolar elasticity theory. This formalism accounts for not only translational micromotions of a medium but also rotational ones. It is found that there appears the phonon band splitting depending on the left- and right-circular polarization in a purely phonon sector without invoking any outside subsystem. The phonon spectrum reveals parity breaking while preserving time-reversal symmetry, i.e., it possesses true chirality. We find that hybridization of the microrotational and translational modes gives rise to the acoustic phonon branch with a "roton" minimum reminiscent of the elementary excitations in the superfluid helium-4. We argue that a mechanism of this phenomena is in line with Nozières' reinterpretation P. Nozières, [J. Low Temp. Phys. 137, 45 (2004)JLTPAC0022-229110.1023/B:JOLT.0000044234.82957.2f] of the rotons as a manifestation of an incipient crystallization instability. We discuss a close analogy between the translational and rotational micromotions in the micropolar elastic medium and the Bogoliubov quasiparticles and gapful density fluctuations in ^{4}He.

Who reads Chirality-Induced Phonon Dispersion in a Noncentrosymmetric Micropolar Crystal?

Author

J. Kishine; A. S. Ovchinnikov; A. A. Tereshchenko

Publisher

The American Physical Society; American Physical Society; American Physical Society (APS) (ISSN 0031-9007)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)