Nonperturbative anharmonic phenomena in crystal lattice dynamics

Katsnelson, M. I.

doi:10.1063/1.1764280

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…It is worth noting that there is a frequency ratio of roughly 1 to 2 of the two lowest lying h ‐BN‐branches with z‐polarization which can result in the non‐perturbative anharmonic effect known as Fermi resonance. This can lead to new phenomena like splitting of the upper branch and low frequency dissipation associated with energy transfer between the two modes .…”

Section: Phononsmentioning

confidence: 99%

“…This can lead to new phenomena like splitting of the upper branch and low frequency dissipation associated with energy transfer between the two modes. [44,45,46,47] In figure 5 we show the phonon dispersion of bulk graphene-h-BN along the line A-Γ and from Γ to 1 / 3 M for the three different stackings. For the A-Γ calculations the unit cell was doubled in the z-direction.…”

Section: Phononsmentioning

confidence: 99%

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Phonons and electron‐phonon coupling in graphene‐h‐BN heterostructures

et al. 2014

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First principle calculations of the phonons of graphene-h-BN heterostructures are presented and compared to those of the constituents. We show that AA and AB' stacking are not only energetically less favoured than AB but also dynamically unstable. We have identified low energy flat phonon branches of h-BN character with out of plane displacement and evaluated their coupling to electrons in graphene.

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Section: Phononsmentioning

confidence: 99%

Section: Phononsmentioning

confidence: 99%

Phonons and electron‐phonon coupling in graphene‐h‐BN heterostructures

et al. 2014

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Phonon anharmonicity: a pertinent review of recent progress and perspective

Wei

Sun

et al. 2021

Sci. China Phys. Mech. Astron.

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Anharmonic lattice vibrations play pivotal roles in the thermal dynamics in condense matters and affect how the atoms interact and conduct heat. An in-depth understanding of the microscopic mechanism of phonon anharmonicity in condensed systems is critical for developing better functional and energy materials. In recent years, various novel behaviors in condense matters driven by phonon anharmonic effects were discovered, such as soft mode phase transition, negative thermal expansion (NTE), multiferroicity, ultralow thermal conductivity (κ), high thermal resistance, and high-temperature superconductivity. These properties have endowed anharmonicity with many promising applications and provided remarkable opportunities for developing "Anharmonicity Engineering"-regulating heat transport towards excellent performance in materials. In this work, we review the recent development of studies on phonon anharmonic effect and summarize its origin, mechanism, research methods, and applications. Besides, the remaining challenges, future trends, and prospects of phonon anharmonicity are also discussed.

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Magnon-phonon Fermi resonance in antiferromagnetic CoF2

Metzger,

Grishunin,

Reinhoffer

et al. 2024

Nat Commun

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Understanding spin-lattice interactions in antiferromagnets is a critical element of the fields of antiferromagnetic spintronics and magnonics. Recently, coherent nonlinear phonon dynamics mediated by a magnon state were discovered in an antiferromagnet. Here, we suggest that a strongly coupled two-magnon-one phonon state in this prototypical system opens a novel pathway to coherently control magnon-phonon dynamics. Utilizing intense narrow-band terahertz (THz) pulses and tunable magnetic fields up to μ0Hext = 7 T, we experimentally realize the conditions of magnon-phonon Fermi resonance in antiferromagnetic CoF2. These conditions imply that both the spin and the lattice anharmonicities harvest energy from the transfer between the subsystems if the magnon eigenfrequency fm is half the frequency of the phonon 2fm = fph. Performing THz pump-infrared probe spectroscopy in conjunction with simulations, we explore the coupled magnon-phonon dynamics in the vicinity of the Fermi-resonance and reveal the corresponding fingerprints of nonlinear interaction facilitating energy exchange between these subsystems.

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Nonperturbative anharmonic phenomena in crystal lattice dynamics

Abstract: Abstract. Slow dynamics of energy transfer between different phonon modes under the resonance conditions is considered. It may result in new effects in the inelastic and quasielastic neutron scattering spectra.

Cited by 3 publications

References 24 publications

Phonons and electron‐phonon coupling in graphene‐h‐BN heterostructures

Phonons and electron‐phonon coupling in graphene‐h‐BN heterostructures

Phonon anharmonicity: a pertinent review of recent progress and perspective

Magnon-phonon Fermi resonance in antiferromagnetic CoF2

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