Mesoscopic effects on Dirac electrons on the surface of topological insulators

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05130
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Hiroshima University
• Principal Investigator: Takane Yositake 広島大学, 先端物質科学研究科, 教授 (40254388)
• Co-Investigator(Renkei-kenkyūsha): IMURA Ken-Ichiro 広島大学, 大学院先端物質科学研究科, 助教 (90391870)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: トポロジカル絶縁体 / ワイル半金属

Outline of Final Research Achievements

By theoretically studying exotic Dirac electron states on the surface of weak，as well as strong, topological insulators in various situations, we have shown that mesoscopic effects manifest themselves in the electron transport properties of Dirac electrons, leading to notable new phenomena. In particular, in the presence of an atomic step structure on the surface of a weak topological insulator, a pseudo perfectly conducting channel is stabilized under a certain condition, giving rise to a significant increase in the electron conductivity of the system. In addition, we have also shown that various mesoscopic phenomena significantly affect the electron transport properties of Weyl semimetal and graphene systems.

Free Research Field

物性理論