Wei, B.; Cai, Q.; Sun, Q.; Su, Y.; Said, A. H.; Abernathy, D. L.; Li, J. Hong C.
Matryoshka Phonon Twining in a-GaN Journal Article
In: Communications Physics, vol. 4, no. 227, 2021.
Abstract | Links | BibTeX | Tags: lattice expansion, metal-insulator transition, phonon, thermal transport
@article{Li2021,
title = {Matryoshka Phonon Twining in a-GaN},
author = {B. Wei and Q. Cai and Q. Sun and Y. Su and A. H. Said and D. L. Abernathy and J. Hong
C. Li},
url = {https://www.nature.com/articles/s42005-021-00727-9},
doi = {10.1038/s42005-021-00727-9},
year = {2021},
date = {2021-10-12},
urldate = {2021-07-01},
journal = {Communications Physics},
volume = {4},
number = {227},
abstract = {Understanding lattice dynamics is crucial for effective thermal management in electronic devices because phonons dominate thermal transport in most semiconductors. α-GaN has become a focus of interest as one of the most important third-generation power semiconductors, however, the knowledge on its phonon dynamics remains limited. Here we show a Matryoshka phonon dispersion of α-GaN with the complementary inelastic X-ray and neutron scattering techniques and the first-principles calculations. Such Matryoshka twinning throughout the basal plane of the reciprocal space is demonstrated to amplify the anharmonicity of the related phonons through creating abundant three-phonon scattering channels and cutting the lifetime of affected modes by more than 50%. Such phonon topology contributes to reducing the in-plane thermal transport, thus the anisotropic thermal conductivity of α-GaN. The results not only have implications for engineering the thermal performance of α-GaN, but also offer valuable insights on the role of anomalous phonon topology in thermal transport of other technically semiconductors.},
keywords = {lattice expansion, metal-insulator transition, phonon, thermal transport},
pubstate = {published},
tppubtype = {article}
}
Wei, B.; Sun, Q.; Li, C.; Hong, J.
Phonon anharmonicity: a pertinent review of recent progress and perspective Journal Article Forthcoming
In: SCIENCE CHINA Physics, Mechanics & Astronomy, Forthcoming.
BibTeX | Tags: anharmonicity, lifetime, metal-insulator transition, neutron scattering, thermal transport, vibrational entropy
@article{Hong2021,
title = {Phonon anharmonicity: a pertinent review of recent progress and perspective},
author = {B. Wei and Q. Sun and C. Li and J. Hong},
year = {2021},
date = {2021-07-01},
journal = {SCIENCE CHINA Physics, Mechanics \& Astronomy},
keywords = {anharmonicity, lifetime, metal-insulator transition, neutron scattering, thermal transport, vibrational entropy},
pubstate = {forthcoming},
tppubtype = {article}
}
Budai, J D; Hong, J; Manley, M E; Specht, E D; Li, Chen W; Tischler, J Z; Abernathy, D L; Said, A H; Leu, B M; Boatner, L A; McQueeney, R J; Delaire, O
Metallization of vanadium dioxide driven by large phonon entropy Journal Article
In: Nature, vol. 515, no. 7528, pp. 535-539, 2014.
Links | BibTeX | Tags: anharmonicity, metal-insulator transition, neutron, phonon, synchrotron, thermodynamics, vibrational entropy
@article{budai_metallization_2014,
title = {Metallization of vanadium dioxide driven by large phonon entropy},
author = {J D Budai and J Hong and M E Manley and E D Specht and Chen W Li and J Z Tischler and D L Abernathy and A H Said and B M Leu and L A Boatner and R J McQueeney and O Delaire},
url = {http://www.nature.com/doifinder/10.1038/nature13865},
doi = {10.1038/nature13865},
year = {2014},
date = {2014-11-01},
journal = {Nature},
volume = {515},
number = {7528},
pages = {535-539},
keywords = {anharmonicity, metal-insulator transition, neutron, phonon, synchrotron, thermodynamics, vibrational entropy},
pubstate = {published},
tppubtype = {article}
}