| Project/Area Number |
19F19353
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 28020:Nanostructural physics-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
野村 政宏 東京大学, 先端科学技術研究センター, 准教授 (10466857)
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| Co-Investigator(Kenkyū-buntansha) |
GUO YANGYU 東京大学, 先端科学技術研究センター, 外国人特別研究員
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| Project Period (FY) |
2019-11-08 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2021: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2020: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2019: ¥400,000 (Direct Cost: ¥400,000)
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| Keywords | phonon / phonon hydrodynamics / quantum heat transport / phonon NEGF formalism / recursive algorithm / phonon vortex / Anharmonic phonon NEGF / Fourier’s representation / MPI parallelization / heat transport |
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| Outline of Research at the Start |
We plan to establish the non-equilibrium Green function computational framework with anharmonic phonon-phonon scattering taken into account. Heat transport through silicon and germanium thin films as well as Si/Ge interface will be considered in establishing the algorithm. As a first step, we plan to adopt the modified valence force field empirical atomic interaction models for both silicon and germanium. This computational framework will be validated for heat transport through bulk Si and Ge at different temperatures, and heat transport through Si/Ge interface at room temperature.
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| Outline of Annual Research Achievements |
The research achievements under the support of JSPS fellowship mainly include three aspects:
(1) We develop the three-dimensional anharmonic phonon non-equilibrium Green’s function formalism, and a parallelized computational framework for large-scale quantum heat transport simulation. With the new methodology, the open question of how anharmonic phonon-phonon scattering plays the role in heat transport at solid-solid interface is studied with a local spectral energy exchange decomposition scheme. Also we present a novel path to demonstrate phonon localization in graded superlattices and a thermal conductivity minimum phenomenon in the quantum coherent regime.
(2) We develop a mesoscopic simulation framework based on the phonon Boltzmann equation under Callaway’s dual relaxation model with fully ab initio input of phonon properties for both isotropic and anisotropic material systems. With the new method, we investigate the size effect of phonon hydrodynamics in graphitic nano- and micro-structures, and promote the experimental observation of phonon Poiseuille flow in micro-meter-scale isotopically purified graphite ribbon.
(3) We develop a coupled model for heat transport along polar dielectric nanostructures via phonons and surface phonon polaritons. A universal quantum of two-dimensional heat transport in ultrathin polar films is derived for surface phonon polaritons. The non-linear temperature profile due to the coupled dynamics is also demonstrated.
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| Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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