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Ultrafast nonlinear phonon response of few-layer hexagonal boron nitride

Abstract : Nonequilibrium dynamics of TO phonons and low-frequency interlayer shear modes are mapped in femtosecond mid-infrared pump-probe experiments. Time-resolved changes of TO phonon absorption reveal a TO phonon lifetime of 1.2 ps, while the low-frequency excitations decay with a time constant of approximately 20 ps. The coupling of intralayer TO and interlayer motions manifests in a quasi-instantaneous redshift of the TO phonon resonance by some 10 cm −1. Theoretical calculations account for the coupling scenario and underline the relevance of inter-phonon interactions for the nonlinear phonon response of few-layer materials.
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Submitted on : Tuesday, October 12, 2021 - 11:41:25 AM
Last modification on : Friday, December 3, 2021 - 11:43:18 AM

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Taehee Kang, Jia Zhang, Achintya Kundu, Klaus Reimann, Michael Woerner, et al.. Ultrafast nonlinear phonon response of few-layer hexagonal boron nitride. Physical Review B: Condensed Matter (1978-1997), American Physical Society, 2021, 104 (14), pp.L140302. ⟨10.1103/PhysRevB.104.L140302⟩. ⟨hal-03374670⟩

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