Diagnosing topological phononic materials by first-principle calculations

2022 年度 研究成果報告書

• 研究課題/領域番号: 21K13865
• 研究種目: 若手研究
• 配分区分: 基金
• 審査区分: 小区分13020:半導体、光物性および原子物理関連
• 研究機関: 東京工業大学
• 研究代表者: Zhang Tiantian 東京工業大学, 理学院, 特任助教 (50875101)
• 研究期間 (年度): 2021-04-01 – 2023-03-31
• キーワード: Z2 Dirac points / node-line surface states / chiral phonon theory / truly chiral phonons / new surface states / kagome node-line metal

研究成果の概要

I proposed node-line surface phonon material SnIP, kagome node-line metal Ni3In2S2, 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.

自由記述の分野

theoretical physics

研究成果の学術的意義や社会的意義

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.