Specular Scattering Probability of Acoustic Phonons in Atomically Flat Interfaces | Zendy

YuChieh Wen | Zendy; ChiaLung Hsieh | Zendy; KungHsuan Lin | Zendy; Hung-Pin Chen | Zendy; Shu-Cheng Chin | Zendy; ChingLien Hsiao | Zendy; Yuan-Ting Lin | Zendy; Chia-Seng Chang | Zendy; YuanChih Chang | Zendy; Li-Wei Tu | Zendy; ChiKuang Sun | Zendy

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Specular Scattering Probability of Acoustic Phonons in Atomically Flat Interfaces

Author(s) -

YuChieh Wen,

ChiaLung Hsieh,

KungHsuan Lin,

Hung-Pin Chen,

Shu-Cheng Chin,

ChingLien Hsiao,

Yuan-Ting Lin,

Chia-Seng Chang,

YuanChih Chang,

Li-Wei Tu,

ChiKuang Sun

Publication year - 2009

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.103.264301

Subject(s) - specular reflection , scattering , phonon , optics , materials science , physics , condensed matter physics

We report a direct determination of the specular scattering probability of acoustic phonons at a crystal boundary by observing the escape of incident coherent phonons from the coherent state during reflection. In the sub-THz frequency range where the phonon wavelength is much longer than the lattice constant, the acoustic phonon-interface interaction is found to agree well with the macroscopic theory on wave scattering from rough surfaces. This examination thus quantitatively verifies the dominant role of atomic-scale corrugations in the Kapitza anomaly observed at 1-10 K and further opens a new path to nondestructively estimate subnanoscale roughness of buried interfaces.

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