2022 Fiscal Year Final Research Report
Diagnosing topological phononic materials by first-principle calculations
| Project/Area Number |
21K13865
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
ZHANG TIANTIAN 東京工業大学, 理学院, 特任助教 (50875101)
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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Keywords | Z2 Dirac points / node-line surface states / chiral phonon theory / truly chiral phonons / new surface states / kagome node-line metal |
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| Outline of Final Research Achievements |
I proposed node-line surface phonon material SnIP, kagome node-line metal Ni3In2S2 (which is also domenstrated by experiments), Z2 Dirac point with multi-helicoid surface states. I built the theory for chiral phonons in non-symmorphic systems and systems with approximate screw symmetry, and demonstrate the truly chiral phonon in HgS together with Raman scattering collaboraters.
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| Free Research Field |
theoretical physics
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| Academic Significance and Societal Importance of the Research Achievements |
The first proposed node-line surface phonon material SnIP and Z2 Dirac point with multi-helicoid surface states promote the topological band theory. Theories on chiral phonons in non-symmorphic/approximate symmetry systems will triger follow-up studies, and open new avenues in this field.
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