Extremely Large Response of Phonon Coherence in Twisted Penta‐NiN2 Bilayer
Source abstract
Abstract
Abstract Twisting has recently been demonstrated as an effective strategy for tuning the interactions between particles or quasi‐particles in layered materials. Motivated by the recent experimental synthesis of pentagonal NiN2 sheet [ACS Nano 2021, 15, 13539], for the first time, the response of phonon coherence to twisting in bilayer penta‐NiN2, going beyond the particle‐like phonon transport is studied. By using the unified theory of phonon transport and high order lattice anharmonicity, together with the self‐consistent phonon theory, it is found that the lattice thermal conductivity is reduced by 80.6% from 33.35 to 6.47 W m−1 K−1 at 300 K when the layers are twisted. In particular, the contribution of phonon coherence is increased sharply by an order of magnitude, from 0.21 to 2.40 W m−1 K−1 , due to the reduced differences between the phonon frequencies and enhanced anharmonicity after the introduction of twist. The work provides a fundamental understanding of the phonon interaction in twisted pentagonal sheets.
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Research context
OpenAlex topics: Thermal properties of materials · Advanced Thermoelectric Materials and Devices · Graphene research and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering CAPT BKL‐MEMD Peking University Beijing 100871 China
Institute of Engineering Innovation School of Engineering The University of Tokyo Bunkyo‐ku Tokyo 113‐0032 Japan
Pritzker School of Molecular Engineering University of Chicago Chicago IL 60 637 USA
Institute for Materials Research Tohoku University Sendai 980–8577 Japan
New Industry Creation Hatchery Center Tohoku University Sendai 980–8577 Japan
Department of Physics Suranaree University of Technology Nakhon Ratchasima 30000 Thailand
Department of Physics and Nanotechnology SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India
Department of Physics Virginia Commonwealth University Richmond VA 23284 USA
Funding
National Natural Science Foundation of China
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