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: HATTORI Kiminori 大阪大学, 基礎工学研究科, 准教授 (80228486)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥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.

Research Products

• [Journal Article] Edge States in a Thin Film of Disordered Topological Insulator (2015)
  • Author(s): Kiminori Hattori
  • Journal Title: Journal of the Physical Society of Japan Volume: 84 Issue: 4 Pages: 044701-044701
  • DOI: 10.7566/jpsj.84.044701
  • NAID: 40020425898
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Charge induction and polarization on the surface of a topological insulator due to an emergent gauge field (2014)
  • Author(s): Kiminori Hattori
  • Journal Title: Journal of the Physical Society of Japan Volume: 83 Issue: 3 Pages: 034704-034704
  • DOI: 10.7566/jpsj.83.034704
  • NAID: 40020017794
  • Peer Reviewed
• [Journal Article] Topological Pumping of Spin-Polarized Currents through Helical Edge States Due to Dynamically Generated Mass Gap (2013)
  • Author(s): Kiminori Hattori
  • Journal Title: Journal of the Physical Society of Japan Volume: 82 Issue: 2 Pages: 024708-024708
  • DOI: 10.7566/jpsj.82.024708
  • NAID: 210000132420
  • Peer Reviewed
• [Presentation] 乱れたトポロジカル絶縁体薄膜の量子伝導 (2014)
  • Author(s): 服部公則
  • Organizer: 日本物理学会
  • Place of Presentation: 中部大学春日井キャンパス
  • Year and Date: 2014-09-07 – 2014-09-10
• [Presentation] トポロジカル絶縁体表面上のカイラルエッジ状態と量子電荷誘導 (2013)
  • Author(s): 服部公則
  • Organizer: 日本物理学会
  • Place of Presentation: 徳島大学常三島キャンパス
• [Presentation] ヘリカルエッジ状態の局所ギャップを介した量子ポンピング (2012)
  • Author(s): 服部公則
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学常盤台キャンパス