Direct Measurement of Anharmonic Decay Channels of a Coherent Phonon.
In: Physical review letters, Jg. 121 (2018-09-21), Heft 12, S. 125901
Online
academicJournal
Zugriff:
We report channel-resolved measurements of the anharmonic coupling of the coherent A_{1g} phonon in photoexcited bismuth to pairs of high wave vector acoustic phonons. The decay of a coherent phonon can be understood as a parametric resonance process whereby the atomic displacement periodically modulates the frequency of a broad continuum of modes. This coupling drives temporal oscillations in the phonon mean-square displacements at the A_{1g} frequency that are observed across the Brillouin zone by femtosecond x-ray diffuse scattering. We extract anharmonic coupling constants between the A_{1g} and several representative decay channels that are within an order of magnitude of density functional perturbation theory calculations.
Titel: |
Direct Measurement of Anharmonic Decay Channels of a Coherent Phonon.
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Autor/in / Beteiligte Person: | Teitelbaum, SW ; Henighan, T ; Huang, Y ; Liu, H ; Jiang, MP ; Zhu, D ; Chollet, M ; Sato, T ; Murray, ÉD ; Fahy, S ; O'Mahony, S ; Bailey, TP ; Uher, C ; Trigo, M ; Reis, DA |
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Zeitschrift: | Physical review letters, Jg. 121 (2018-09-21), Heft 12, S. 125901 |
Veröffentlichung: | New York : American Physical Society, 2018 |
Medientyp: | academicJournal |
ISSN: | 1079-7114 (electronic) |
DOI: | 10.1103/PhysRevLett.121.125901 |
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