Theoretical studies of topological and electron correlation effects in graphene
| Project/Area Number |
22740196
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
EZAWA Motohiko 東京大学, 大学院工学系研究科, 助教 (10504805)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | グラフェン / シリセン / トポロジカル絶縁体 / スキルミオン / 量子スピンホール効果 / チャーン数 / メロン / 量子異常ホール効果 / トポロジー / 電子相関 / グラフェン・ナノリボン / 場の理論 / トポロジカル相転移 / スカーミオン / バイメロン / ナノグラフェン / グラフェン・ナノディスク / ディラック電子 / 量子ドット / スピン軌道相互作用 / 渦度 |
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| Research Abstract |
I studied electronic and topological properties of graphene and silicene (graphene's cousin).In particular, I analyzed various topological insulators and their topological phase transitions. Main results read as follows: The zero-energy sector of the triangular zigzag graphene is investigated based on the Dirac theory of graphene.Analytic wave functions of triangular graphene are obtained. A vortex with the winding number 2 emerges in triangular graphene. Graphene nanodisk arrays have multi-degenerate perfect flat bands and are ferromagnet. The band gap of silicene can be controlled by external electric field applied perpendicular to silicene. Silicene shows the quantum anomalous-Hall effect when ferromagnet is attached. Furthermore, silicene undergoes a topological phase transition by photo-irradiation, where single-Dirac cone states appear at the critical point.I also studied the skyrmion, which is a topological structure in magnet.
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Report
(4 results)
Research Products
(49 results)
