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Interaction-induced topological phase transition of ultracold atoms in an optical superlattice

Research Project

Project/Area Number 18K13480
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionKyoto University

Principal Investigator

Nakajima Shuta  京都大学, 白眉センター, 特定准教授 (70625160)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords冷却原子 / 光格子 / 光超格子 / トポロジカル量子系 / フェッシュバッハ共鳴 / 量子相転移 / 乱れ / 量子光学
Outline of Final Research Achievements

In this research project, we aimed to (1). construct a system of ultracold lithium (Li) atoms with tunable interactions and (2). verify interaction effects on the Thouless quantum pumping (TQP).
For (1), we constructed an ultra-high vacuum chamber setup and realized the two-dimensional magneto-optical trapping of Li atoms. Thus, we have finished the construction of the platform for the future ultracold Li atom experiments. For (2), we studied the interaction effect on a TQP system with ytterbium atoms in an optical lattice and observed a small change in the pumping amount due to the interaction. In addition, the non-trivial topological phase induced by disorder has attracted much attention recently. Therefore, we have investigated such a study in our setup and experimentally found a disorder-induced non-trivial pumping sequence.

Academic Significance and Societal Importance of the Research Achievements

相互作用がない場合のトポロジカル量子現象については近年その分類や解明が進んだが、強い乱れや相互作用により誘起されるトポロジカル量子現象の研究はまだ発展途上である。我々は光格子中の冷却原子系を用いたトポロジカル量子ポンプ系において、「乱れ」により誘起される非自明なポンプ系を実現したが、これは乱れ誘起トポロジカル量子現象を実験的に構築する手法を見出したという点で学術的意義がある。また一般にトポロジカル量子現象は摂動に対して堅牢で、量子ホール抵抗のような量子標準技術への応用があるが、新しいクラスのトポロジカル量子現象の実現は、そうした新しいタイプの量子デバイスの開発にもつながりうると期待される。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (4 results)

All 2020 2019 2018

All Presentation (4 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results)

  • [Presentation] 乱れにより誘起されるサウレス量子ポンプ2020

    • Author(s)
      中島秀太, 武井宣幸, 佐久間啓太, 久野義人, 高橋義朗
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 冷却原子系を用いた量子シミュレーション2019

    • Author(s)
      中島秀太
    • Organizer
      シミュレーションによる宇宙の基本法則と進化の解明に向けて (QUCS 2019)
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 冷却原子系を用いた量子シミュレーション2018

    • Author(s)
      中島秀太
    • Organizer
      物性研短期研究会 量子情報・物性の新潮流
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Topological Thouless Pumping in a One-Dimensional Optical Superlattice2018

    • Author(s)
      Shuta Nakajima
    • Organizer
      Shuta Nakajima The 2nd TMS-PKU Alliance Workshop on Topological Materials and Quantum Materials
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2018-04-23   Modified: 2021-02-19  

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