@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}

}

@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}

}

@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}

}