2014 Fiscal Year Final Research Report
Quantum Spin Hall Effect in Mesoscopic Systems
| Project/Area Number |
24540322
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 量子スピンホール効果 / 量子異常ホール効果 / トポロジカル絶縁体 / メゾスコピック系 / スピントロニクス |
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| Outline of Final Research Achievements |
The quantum spin Hall (QSH) effect and its related topological phenomena are investigated extensively. Topological pumping is realizable due to a rotating magnetic field through gapped edge states of a QSH insulator. The induced spin flow causes a longitudinal electric polarization analogous to the inverse QSH effect. An emergent gauge field coupled to surface magnetization gives rise to charge induction and polarization on the surface of a topological insulator (TI) via the quantum anomalous Hall (QAH) effect, enabling a local evaluation of the QAH transport without Hall measurements. Nonmagnetic disorder generically forces thin-film TIs into the QSH phase. The phase transition is accounted for by a disorder-induced band inversion in terms of the effective two-dimensional (2D) model into which the realistic 3D nature of disorder potential is absorbed.
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| Free Research Field |
固体物理
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