Quantum Spin Hall Effect in Mesoscopic Systems
Project/Area Number |
24540322
|
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 | Osaka University |
Principal Investigator |
|
Project Period (FY) |
2012-04-01 – 2015-03-31
|
Project Status |
Completed (Fiscal Year 2014)
|
Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
|
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 / エッジ状態 / 局在非局在転移 / トポロジカルポンピング |
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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Report
(4 results)
Research Products
(6 results)