Anomalous Nanoscale Optoacoustic Phonon Mixing in Nematic Mesogens

Bolmatov, Dima; Soloviov, Dmytro; Zav’yalov, Dmitry; Sharpnack, Lewis; Agra-Kooijman, Deña M.; Kumar, Satyendra; Zhang, Jiawei; Liu, Mengkun; Katsaras, John

doi:10.1021/acs.jpclett.8b00926

Title: Anomalous Nanoscale Optoacoustic Phonon Mixing in Nematic Mesogens

Journal Article · Sun Apr 29 00:00:00 EDT 2018 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.8b00926· OSTI ID:1566960

^[1]; Soloviov, Dmytro ^[2]; Zav’yalov, Dmitry ^[3]; Sharpnack, Lewis ^[4]; Agra-Kooijman, Deña M. ^[5]; Kumar, Satyendra ^[6]; Zhang, Jiawei ^[7]; Liu, Mengkun ^[7];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation); Taras Shevchenko National Univ. of Kyiv (Ukraine); Moscow Inst. of Physics and Technology (MIPT), Moscow (Russian Federation)
Volgograd State Technical Univ. (Russian Federation)
European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Kent State Univ., Kent, OH (United States)
Univ. at Albany, NY (United States)
Stony Brook Univ., NY (United States)

Recent inelastic X-ray scattering (IXS) experiments on mesogens have shown 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. Moreover, 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012704

OSTI ID:: 1566960

Journal Information:: Journal of Physical Chemistry Letters, Vol. 9, Issue 10; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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