Prediction and observation of intermodulation sidebands from anharmonic phonons in NaBr

Y. Shen; C. N. Saunders; C. M. Bernal; D. L. Abernathy; T. J. Williams; M. E. Manley; B. Fultz

doi:10.1103/PhysRevB.103.134302

Prediction and observation of intermodulation sidebands from anharmonic phonons in NaBr

Y. Shen, C. N. Saunders, C. M. Bernal, D. L. Abernathy, T. J. Williams, M. E. Manley, B. Fultz

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A quantum Langevin model, like models from optomechanics, was developed for phonons. It predicts intermodulation phonon sidebands (IPSs) in anharmonic crystals. Ab initio calculations of anharmonic phonons in rock-salt NaBr showed these spectral features as many-body effects. Modern inelastic neutron scattering measurements on a crystal of NaBr at 300 K revealed diffuse intensity at high phonon energy from a predicted upper IPS. The transverse optical (TO) part of the new features originates from phonon intermodulation between the transverse acoustic (TA) and TO phonons. The longitudinal optical spectral features originate from three-phonon coupling between the TA modes and the TO lattice modes. The partner lower IPS proves to be an intrinsic localized mode. Interactions with the thermal bath broaden and redistribute the spectral weight of the IPS pair. These sidebands are a probe of the anharmonicity and quantum noise of phonons in NaBr and suggest novel interactions between photons and phonons.

Original language	English
Article number	134302
Journal	Physical Review B
Volume	103
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.103.134302
State	Published - Apr 12 2021

Funding

We thank O. Hellman, K. Vahala, and F. Yang for helpful discussions. Research at the Spallation Neutron Source (SNS) and the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory was sponsored by the Scientific User Facilities Division, Basic Energy Sciences (BES), Department of Energy (DOE). M.E.M. was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC05-00OR22725. This paper used resources from National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility supported by the Office of Science of the US Department of Energy under Contract No. DE-AC02-05CH11231. This paper was supported by the DOE Office of Science, BES, under Contract No. DE-FG02-03ER46055.

Funders	Funder number
High Flux Isotope Reactor
U.S. Department of Energy
Office of Science	DE-FG02-03ER46055, DE-AC02-05CH11231
Basic Energy Sciences
Division of Materials Sciences and Engineering	DE-AC05-00OR22725

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title = "Prediction and observation of intermodulation sidebands from anharmonic phonons in NaBr",

abstract = "A quantum Langevin model, like models from optomechanics, was developed for phonons. It predicts intermodulation phonon sidebands (IPSs) in anharmonic crystals. Ab initio calculations of anharmonic phonons in rock-salt NaBr showed these spectral features as many-body effects. Modern inelastic neutron scattering measurements on a crystal of NaBr at 300 K revealed diffuse intensity at high phonon energy from a predicted upper IPS. The transverse optical (TO) part of the new features originates from phonon intermodulation between the transverse acoustic (TA) and TO phonons. The longitudinal optical spectral features originate from three-phonon coupling between the TA modes and the TO lattice modes. The partner lower IPS proves to be an intrinsic localized mode. Interactions with the thermal bath broaden and redistribute the spectral weight of the IPS pair. These sidebands are a probe of the anharmonicity and quantum noise of phonons in NaBr and suggest novel interactions between photons and phonons.",

author = "Y. Shen and Saunders, {C. N.} and Bernal, {C. M.} and Abernathy, {D. L.} and Williams, {T. J.} and Manley, {M. E.} and B. Fultz",

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AU - Saunders, C. N.

AU - Bernal, C. M.

AU - Abernathy, D. L.

AU - Williams, T. J.

AU - Manley, M. E.

AU - Fultz, B.

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Prediction and observation of intermodulation sidebands from anharmonic phonons in NaBr

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