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2018 Fiscal Year Final Research Report

Control of band structure and emergent novel phenomena based on band topology

Research Project

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Project/Area Number 26287062
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Condensed matter physics I
Research InstitutionTokyo Institute of Technology

Principal Investigator

Murakami Shuichi  東京工業大学, 理学院, 教授 (30282685)

Project Period (FY) 2014-04-01 – 2019-03-31
Keywordsトポロジカル絶縁体 / ワイル半金属 / トポロジー / スピンエレクトロニクス
Outline of Final Research Achievements

We constructed general theories on phase transitions of topological materials. For example, we showed that a closing of a gap of an insulator without inversion symmetry always leads to a topological semimetal. We also constructed a theory on superlattices of topological semimetals, and a theory on surface-state dispersions of Weyl semimetals. We also proposed various new topological materials, such as tellurium at high pressure as a Weyl semimetal, and calcium at high pressure as a nodal-line semimetal. We also unveiled new physical phenomena of topological materials. We proposed a concept of interfacial symmetries and revealed appearance of novel interfacial states. We also showed an anomalous dielectric response of bilayer graphene ribbons by an interlayer bias voltage.

Free Research Field

物性理論

Academic Significance and Societal Importance of the Research Achievements

トポロジカル物質は、その電子状態がトポロジーで特徴づけられることはわかっているが、それらの物質が固有に持っている、通常の物質と異なる物性、またどのような物質がトポロジカル物質になるかという物理的解釈はいまだ不足している。本研究成果は、その点についての一般論を構築することで、今度のトポロジカル物質の探索や実験に資する。例えばトポロジカル物質の新規提案は実験的な検証へと直結していくことが期待できる。またトポロジカル物質の相転移の理論や超格子の理論などは、広い範囲のトポロジカル物質に適用されるため、今後の本分野への波及効果も大きい。

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Published: 2020-03-30  

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