Theory of nonlinear response induced by electric field in condensed-matter Dirac systems

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400313
• 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: Hokkaido University
• Principal Investigator: SUZUURA Hidekatsu 北海道大学, 工学(系)研究科(研究院), 准教授 (10282683)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ディラック電子 / グラフェン / スピン・軌道相互作用 / 光学応答 / 輸送現象 / トポロジカル絶縁体

Outline of Final Research Achievements

Electromagnetic responses in condensed-matter Dirac systems deeply reflect its singular electronic states. We have theoretically studied the enhancement of singular behaviors in optical responses and transport properties due to external electric fields in the Dirac systems. We have shown that external electric fields induce the red shift of strong optical absorption peak due to excitons in carbon nanotubes and that static screening of external electric fields due to edge states in graphene nanoribbons is strongly modulated by electrostatic electron doping. Further, we have also shown that current-induced spatial distributions of spins in topological insulators are highly dependent on the configurations of electrical contacts with external leads.

Free Research Field

物性理論