Anomalous Nanoscale Optoacoustic Phonon Mixing in Nematic MesogensClick to copy article linkArticle link copied!
- Dima Bolmatov*Dima Bolmatov*E-mail: [email protected], [email protected]Neutron Scattering Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United StatesDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United StatesMore by Dima Bolmatov
- Dmytro SoloviovDmytro SoloviovFrank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna 141980, RussiaTaras Shevchenko National University of Kyiv, Kyiv 01033, UkraineMoscow Institute of Physics and Technology, Dolgoprudny 141701, RussiaMore by Dmytro Soloviov
- Dmitry Zav’yalovDmitry Zav’yalovVolgograd State Technical University, Volgograd 400005, RussiaMore by Dmitry Zav’yalov
- Lewis SharpnackLewis SharpnackEuropean Synchrotron Radiation Facility, Grenoble 38043, FranceMore by Lewis Sharpnack
- Deña M. Agra-KooijmanDeña M. Agra-KooijmanLiquid Crystal Institute, Kent State University, Kent, Ohio 44242, United StatesMore by Deña M. Agra-Kooijman
- Satyendra KumarSatyendra KumarDivision of Research and Department of Physics, University at Albany, Albany, New York 12222, United StatesMore by Satyendra Kumar
- Jiawei ZhangJiawei ZhangDepartment of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, United StatesMore by Jiawei Zhang
- Mengkun LiuMengkun LiuDepartment of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, United StatesMore by Mengkun Liu
- John KatsarasJohn KatsarasNeutron Scattering Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United StatesDepartment of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United StatesMore by John Katsaras
Abstract
Recent inelastic X-ray scattering (IXS) experiments on mesogens have revealed entirely new capabilities with regards to their nanoscale phonon-assisted heat management. Mesogens such as nematic liquid crystals (LCs) are appealing systems for study because their structure and morphology can easily be tuned. We report on Q-resolved ultra-high-resolution IXS, X-ray diffraction, and THz time-domain spectroscopy experiments combined with large-scale all-atom molecular dynamics simulations on the dynamic properties of 5CB LCs. For the first time, we observe a strong mixing of phonon excitations originating from independent in-phase and out-of-phase van-der-Waals-mediated displacement patterns. The coexistence of transverse acoustic and optical modes of 5CB LCs at near room temperature is revealed through the emergent transverse phonon gap and THz light–phonon coupling taking place within the same energy range. Furthermore, our experimental observations are supported by analysis showing correlations of spontaneous fluctuations of LCs on picosecond time scales. These findings are significant for the design of a new generation of soft molecular vibration-sensitive nanoacoustic and optomechanical applications.
Cited By
This article is cited by 13 publications.
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- S. T. Lynch, A. De Francesco, L. Scaccia, A. Suvorov, Y. Q. Cai, D. M. Agra-Kooijman, L. L. Sharpnack, Satyendra Kumar, A. Cunsolo. Shear wave propagation in a liquid crystal: An inelastic X-ray scattering study. The Journal of Chemical Physics 2024, 160
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- Jacob J. Kinnun, Haden L. Scott, Dima Bolmatov, C. Patrick Collier, Timothy R. Charlton, John Katsaras. Biophysical studies of lipid nanodomains using different physical characterization techniques. Biophysical Journal 2023, 122
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- M. G. Izzo, B. Wehinger, S. Cazzato, A. Matic, C. Masciovecchio, A. Gessini, G. Ruocco. Rayleigh scattering and disorder-induced mixing of polarizations in amorphous solids at the nanoscale: 1-octyl-3-methylimidazolium chloride glass. Physical Review B 2020, 102
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- Dima Bolmatov, Jacob J. Kinnun, John Katsaras, Maxim O. Lavrentovich. Phonon-mediated lipid raft formation in biological membranes. Chemistry and Physics of Lipids 2020, 232 , 104979. https://doi.org/10.1016/j.chemphyslip.2020.104979
- Dima Bolmatov, Yong Q. Cai, Dmitry Zav’yalov, Mikhail Zhernenkov. Crossover from picosecond collective to single particle dynamics defines the mechanism of lateral lipid diffusion. Biochimica et Biophysica Acta (BBA) - Biomembranes 2018, 1860
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, 2446-2455. https://doi.org/10.1016/j.bbamem.2018.07.004
- Maria G. Izzo, Giancarlo Ruocco, Stefano Cazzato. The Mixing of Polarizations in the Acoustic Excitations of Disordered Media With Local Isotropy. Frontiers in Physics 2018, 6 https://doi.org/10.3389/fphy.2018.00108
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