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|Title:||Chirality-Induced Phonon Dispersion in a Noncentrosymmetric Micropolar Crystal|
Ovchinnikov, A. S.
Tereshchenko, A. A.
|Publisher:||American Physical Society|
|Citation:||Kishine J. Chirality-Induced Phonon Dispersion in a Noncentrosymmetric Micropolar Crystal / J. Kishine, A. S. Ovchinnikov, A. A. Tereshchenko. — DOI 10.1103/PhysRevLett.125.245302 // Physical Review Letters. — 2020. — Vol. 125. — Iss. 24. — 245302.|
|Abstract:||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 He4. © 2020 American Physical Society.|
TIME REVERSAL SYMMETRIES
|metadata.dc.description.sponsorship:||The authors express special thanks to Yusuke Kato for directing our attention to Refs. . We thank Laurence Barron for continuous encouragement. We also thank Nikolay Baranov, Yoshihiko Togawa, and Hiroshi Yamamoto for stimulating discussions concerning experimental insights. The authors acknowledge JSPS Bilateral Joint Research Projects (JSPS-RFBR), the Russian Foundation for Basic Research (RFBR), Grant No. 20-52-50005. This work was supported by JSPS KAKENHI Grant No. 17H02923. A. S. O. acknowledges funding by Act 211 Government of the Russian Federation, Contract No. 02.A03.21.0006, and the Ministry of Education and Science of Russia, Project No. FEUZ-2020-0054. A. A. T. acknowledges the financial support of Competitiveness Enhancement Program CEP 220.127.116.11-20.|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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