2022 Fiscal Year Annual Research Report
Diagnosing topological phononic materials by first-principle calculations
| Project/Area Number |
21K13865
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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 | topological band theory / topological materials / Dirac points / chiral phonon / DFT calculation |
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| Outline of Annual Research Achievements |
For the last year, I'm mainly focusing on two fields: (1) topological materials and (2) chiral phonons. For (1), we theoretically propose and experimentally demonstrate the endless Dirac nodal lines in kagome-metal Ni3In2S2 [1]. We also propose the Z2 Dirac points with topologically protected multihelicoid surface states [2]. For (2), we not only study the chiral phonon in 2D materials, but also built the theory for chiral phonons and pseudo-angular momentum in non-symmorphic systems. We also collabarate with the Raman scattering researchers to domenstrate the chiral phonon in HgS. We further to study the physics of phonons in systems with approximate screw symmetry.
[1] npj Comput Mat 8 (155) [2] PRR 4, 033170 [3] PRB 105, 235204 [4] PRR 4, L012024 [5] NatPhys 19,142-142 [6] PRB 106, 184104
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