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, 4 (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}
}
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.
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}
}
Angeles, F.; Sun, Q.; Ortiz, V.; Shi, J.; Li, C.; Wilson, R. B.
Interfacial thermal transport in spin caloritronic material systems Journal Article Forthcoming
In: Physical Review Materials, Forthcoming.
BibTeX | Tags: lattice dynamics, thermal transport
@article{Wilson2021,
title = {Interfacial thermal transport in spin caloritronic material systems},
author = {F. Angeles and Q. Sun and V. Ortiz and J. Shi and C. Li and R. B. Wilson},
year = {2021},
date = {2021-07-01},
journal = {Physical Review Materials},
keywords = {lattice dynamics, thermal transport},
pubstate = {forthcoming},
tppubtype = {article}
}
Niedziela, J. L.; Bansal, D.; Ding, J.; Lanigan-Atkins, T.; Li, Chen; May, A. F.; Wang, H.; Lin, J. Y. Y.; Abernathy, D. L.; Ehlers, G.; Huq, A.; Parshall, D.; Lynn, J. W.; Delaire, O.
Controlling phonon lifetimes via sublattice disordering in AgBiSe2 Journal Article
In: Phys. Rev. Materials, 4 , pp. 105402, 2020.
Abstract | Links | BibTeX | Tags: lattice dynamics, phonon, thermal transport
@article{Delaire2020,
title = {Controlling phonon lifetimes via sublattice disordering in AgBiSe2},
author = {J. L. Niedziela and D. Bansal and J. Ding and T. Lanigan-Atkins and Chen Li and A. F. May and H. Wang and J. Y. Y. Lin and D. L. Abernathy and G. Ehlers and A. Huq and D. Parshall and J. W. Lynn and O. Delaire},
url = {https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.4.105402},
doi = {10.1103/PhysRevMaterials.4.105402},
year = {2020},
date = {2020-08-04},
journal = {Phys. Rev. Materials},
volume = {4},
pages = {105402},
abstract = {Understanding and controlling microscopic heat transfer mechanisms in solids is critical to material design in numerous technological applications. Yet, the current understanding of thermal transport in semiconductors and insulators is limited by the difficulty in directly measuring individual phonon lifetimes and mean free paths, and studying their dependence on the microscopic state of the material. Here we report our measurements of microscopic phonon scattering rates in AgBiSe2, which exhibits a controllable, reversible change directly linked to microstructure evolution near a reversible structural phase transition, that directly impacts the thermal conductivity. We demonstrate a steplike doubling of phonon scattering rates resultant from the cation disordering at the structural transition. To rationalize the neutron scattering data, we leverage a stepwise approach to account for alterations to the thermal conductivity that are imparted by distinct scattering mechanisms. These results highlight the potential of tunable microstructures housed in a stable crystal matrix to provide a practical route to tailor phonon scattering to optimize thermal transport properties.},
keywords = {lattice dynamics, phonon, thermal transport},
pubstate = {published},
tppubtype = {article}
}
Understanding and controlling microscopic heat transfer mechanisms in solids is critical to material design in numerous technological applications. Yet, the current understanding of thermal transport in semiconductors and insulators is limited by the difficulty in directly measuring individual phonon lifetimes and mean free paths, and studying their dependence on the microscopic state of the material. Here we report our measurements of microscopic phonon scattering rates in AgBiSe2, which exhibits a controllable, reversible change directly linked to microstructure evolution near a reversible structural phase transition, that directly impacts the thermal conductivity. We demonstrate a steplike doubling of phonon scattering rates resultant from the cation disordering at the structural transition. To rationalize the neutron scattering data, we leverage a stepwise approach to account for alterations to the thermal conductivity that are imparted by distinct scattering mechanisms. These results highlight the potential of tunable microstructures housed in a stable crystal matrix to provide a practical route to tailor phonon scattering to optimize thermal transport properties.
Sun, Qiyang; Li, Chen W.
Exploring nanoscale heat transport via neutron scattering Book Chapter
In: Liao, Bolin (Ed.): pp. 11-1~14, 2020, ISBN: 978-0-7503-1736-8.
Abstract | Links | BibTeX | Tags: lattice dynamics, phonon, thermal transport
@inbook{Sun2020,
title = {Exploring nanoscale heat transport via neutron scattering},
author = {Qiyang Sun and Chen W. Li},
editor = {Bolin Liao},
url = {https://iopscience.iop.org/book/978-0-7503-1738-2},
isbn = {978-0-7503-1736-8},
year = {2020},
date = {2020-03-01},
pages = {11-1~14},
abstract = {Nanoscale Energy Transport
Emerging phenomena, methods and applications
This book brings together leading names in the field of nanoscale energy transport to provide a comprehensive and insightful review of this developing topic. The text covers new developments in the scientific basis and the practical relevance of nanoscale energy transport, highlighting the emerging effects at the nanoscale that qualitatively differ from those at the macroscopic scale. Throughout the book, microscopic energy carriers are discussed, including photons, electrons and magnons. State-of-the-art computational and experimental nanoscale energy transport methods are reviewed, and a broad range of materials system topics are considered, from interfaces and molecular junctions to nanostructured bulk materials. Nanoscale Energy Transport is a valuable reference for researchers in physics, materials, mechanical and electrical engineering, and it provides an excellent resource for graduate students.},
keywords = {lattice dynamics, phonon, thermal transport},
pubstate = {published},
tppubtype = {inbook}
}
Nanoscale Energy Transport
Emerging phenomena, methods and applications
This book brings together leading names in the field of nanoscale energy transport to provide a comprehensive and insightful review of this developing topic. The text covers new developments in the scientific basis and the practical relevance of nanoscale energy transport, highlighting the emerging effects at the nanoscale that qualitatively differ from those at the macroscopic scale. Throughout the book, microscopic energy carriers are discussed, including photons, electrons and magnons. State-of-the-art computational and experimental nanoscale energy transport methods are reviewed, and a broad range of materials system topics are considered, from interfaces and molecular junctions to nanostructured bulk materials. Nanoscale Energy Transport is a valuable reference for researchers in physics, materials, mechanical and electrical engineering, and it provides an excellent resource for graduate students.
Emerging phenomena, methods and applications
This book brings together leading names in the field of nanoscale energy transport to provide a comprehensive and insightful review of this developing topic. The text covers new developments in the scientific basis and the practical relevance of nanoscale energy transport, highlighting the emerging effects at the nanoscale that qualitatively differ from those at the macroscopic scale. Throughout the book, microscopic energy carriers are discussed, including photons, electrons and magnons. State-of-the-art computational and experimental nanoscale energy transport methods are reviewed, and a broad range of materials system topics are considered, from interfaces and molecular junctions to nanostructured bulk materials. Nanoscale Energy Transport is a valuable reference for researchers in physics, materials, mechanical and electrical engineering, and it provides an excellent resource for graduate students.
Bansal, D; Li, Chen W; Said, A H; Abernathy, D L; Yan, J
Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3Sb7−xTex Journal Article
In: Physical Review B, 92 (21), pp. 214301, 2015.
Links | BibTeX | Tags: electron-phonon coupling, phonon, thermal transport, thermoelectric
@article{bansal_electron-phonon_2015-2,
title = {Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3Sb7−xTex},
author = {D Bansal and Chen W Li and A H Said and D L Abernathy and J Yan},
url = {https://link.aps.org/doi/10.1103/PhysRevB.92.214301},
doi = {10.1103/PhysRevB.92.214301},
year = {2015},
date = {2015-01-01},
journal = {Physical Review B},
volume = {92},
number = {21},
pages = {214301},
keywords = {electron-phonon coupling, phonon, thermal transport, thermoelectric},
pubstate = {published},
tppubtype = {article}
}