Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session S29: Electrons, Phonons, Electron Phonon Scattering and Phononics IV
11:15 AM–2:15 PM,
Thursday, March 8, 2018
LACC
Room: 406A
Sponsoring
Units:
DCOMP DMP
Chair: Jiong Yang, Shanghai University
Abstract ID: BAPS.2018.MAR.S29.11
Abstract: S29.00011 : Energy Waves in Harmonic Crystals: Phonon Interference and Apparent Dissipation
1:39 PM–1:51 PM
Presenter:
Anant Raj
(Nuclear Engineering, North Carolina State University)
Authors:
Anant Raj
(Nuclear Engineering, North Carolina State University)
Jacob Eapen
(Nuclear Engineering, North Carolina State University)
Reducing the dimensionality to a linear chain, we map the possible combinations of wave vectors that can generate energy waves. These modes decay in time appearing as an apparent dissipation even with harmonic interactions. We also derive an analytical expression for the energy dispersion in a harmonic chain – intriguingly, we observe a nearly linear energy dispersion relationship, which establishes that energy waves in a harmonic chain are not dissimilar to elastic waves of a continuum. While group velocity become vanishingly small near the Brillouin zone boundaries for phonon vibrational modes, the energy waves propagate at all wave vectors with nearly the same speed.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.S29.11
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