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Investigation on atomic dynamics of a subrecoil laser cooling

Research Project

Project/Area Number 18K03468
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
Research InstitutionTokyo University of Science

Principal Investigator

Akimoto Takuma  東京理科大学, 理工学部物理学科, 准教授 (30454044)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords非平衡現象 / 無限測度エルゴード理論 / レーザー冷却 / 非平衡物理学 / 非平衡統計力学 / 異常拡散 / 無限測度 / 確率過程 / 非定常過程 / 非定常拡散過程
Outline of Final Research Achievements

A purpose of my research project is to investigate a non-stationary atomic dynamics in a subrecoil laser cooling on the basis of the infinite ergodic theory. In this research project, we focus on an atomic dynamics of a subrecoil laser cooling. Using stochastic models of subrecoil laser cooling, we have provided the ergodic property of the atomic dynamics. In 2020, we found the infinite ergodic theory for a semi-Markov process, which is published in Phys. Rev. E. Based on the infinite ergodic theory, we provided the infinite ergodic theory for a stochastic model of subrecoil laser cooling, whose results were published in Phys. Rev. Lett. and J. Chem. Phys. in 2021 and 2022, respectively.

Academic Significance and Societal Importance of the Research Achievements

本研究プロジェクトでは、サブリコイルレーザー冷却における原子のダイナミクスの非定常性の基礎付けを行うことを目的としている。プロジェクト期間内で、レーザー冷却と関係したセミマルコフ過程とレーザー冷却の確率モデルを用いて、観測量の時間平均の振る舞いを明らかにしてきた。これらの理論は、数学の無限測度エルゴード理論と密接な関係があり、これまでに無限測度エルゴード理論の拡張となっている。また、無限測度エルゴード理論をレーザー冷却過程へ応用することにより、確率モデルのパラメータにおいてエルゴード特性が転移する点において冷却の効率が最大となることがわかった。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (28 results)

All 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (8 results) Journal Article (12 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 12 results,  Open Access: 5 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Remarks (2 results)

  • [Int'l Joint Research] Bar-Ilan University(イスラエル)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Chemnitz University of Technology(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Bar-Ilan University(イスラエル)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] ケムニッツ工科大学(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Bar-Ilan University(イスラエル)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] ケムニッツ工科大学(ドイツ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Bar-Ilan大学(イスラエル)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] ケムニッツ工科大学(ドイツ)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Gas of sub-recoiled laser cooled atoms described by infinite ergodic theory2022

    • Author(s)
      Barkai Eli、Radons G?nter、Akimoto Takuma
    • Journal Title

      The Journal of Chemical Physics

      Volume: 156 Issue: 4 Pages: 044118-044118

    • DOI

      10.1063/5.0076552

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Detrended fluctuation analysis of earthquake data2021

    • Author(s)
      Takumi Kataoka; Tomoshige Miyaguchi; Takuma Akimoto
    • Journal Title

      Physical Review Research

      Volume: 3 Issue: 3 Pages: 033081-033081

    • DOI

      10.1103/physrevresearch.3.033081

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Transitions in the Ergodicity of Subrecoil-Laser-Cooled Gases2021

    • Author(s)
      Barkai Eli、Radons G?nter、Akimoto Takuma
    • Journal Title

      Physical Review Letters

      Volume: 127 Issue: 14 Pages: 140605-140605

    • DOI

      10.1103/physrevlett.127.140605

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Universal Relation between Instantaneous Diffusivity and Radius of Gyration of Proteins in Aqueous Solution2021

    • Author(s)
      Yamamoto Eiji、Akimoto Takuma、Mitsutake Ayori、Metzler Ralf
    • Journal Title

      Physical Review Letters

      Volume: 126 Issue: 12 Pages: 128101-128101

    • DOI

      10.1103/physrevlett.126.128101

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Aging arcsine law in Brownian motion and its generalization2020

    • Author(s)
      Akimoto Takuma、Sera Toru、Yamato Kosuke、Yano Kouji
    • Journal Title

      Physical Review E

      Volume: 102 Issue: 3 Pages: 032103-032103

    • DOI

      10.1103/physreve.102.032103

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Infinite invariant density in a semi-Markov process with continuous state variables2020

    • Author(s)
      Akimoto Takuma、Barkai Eli、Radons Gunter
    • Journal Title

      Physical Review E

      Volume: 101 Issue: 5 Pages: 052112-052112

    • DOI

      10.1103/physreve.101.052112

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Reduction of the synchronization time in random logistic maps2020

    • Author(s)
      Sano Kaito、Mitsui Takahito、Akimoto Takuma
    • Journal Title

      Physical Review E

      Volume: 102 Issue: 6 Pages: 062209-062209

    • DOI

      10.1103/physreve.102.062209

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Exact results for first-passage-time statistics in biased quenched trap models2019

    • Author(s)
      Takuma Akimoto and Keiji Saito
    • Journal Title

      Physical Review E

      Volume: 99 Issue: 5 Pages: 052127-052127

    • DOI

      10.1103/physreve.99.052127

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Brownian motion with alternately fluctuating diffusivity: Stretched-exponential and power-law relaxation2019

    • Author(s)
      Tomoshige Miyaguchi; Takashi Uneyama; Takuma Akimoto
    • Journal Title

      Physical Review E

      Volume: 100 Issue: 1 Pages: 012116-012116

    • DOI

      10.1103/physreve.100.012116

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Unveiling diffusive states from center-of-mass trajectories in glassy dynamics2019

    • Author(s)
      Yuto Hachiya, Takashi Uneyama, Toshihiro Kaneko, and Takuma Akimoto
    • Journal Title

      Journal of Chemical Physics

      Volume: 151 Issue: 3 Pages: 034502-034502

    • DOI

      10.1063/1.5100640

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Relaxation functions of the Ornstein-Uhlenbeck process with fluctuating diffusivity2019

    • Author(s)
      Takashi Uneyama; Tomoshige Miyaguchi; Takuma Akimoto
    • Journal Title

      Physical Review E

      Volume: 99 Issue: 3 Pages: 032127-032127

    • DOI

      10.1103/physreve.99.032127

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Enhancement, slow relaxation, ergodicity and rejuvenation of diffusion in biased continuous-time random walks2018

    • Author(s)
      T. Akimoto, A. Cherstvy, R. Metzler
    • Journal Title

      Physical Review E

      Volume: 98 Issue: 2 Pages: 022105-022110

    • DOI

      10.1103/physreve.98.022105

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] レーザー冷却過程の不均一ランダムウォークモデル におけるエルゴード特性2022

    • Author(s)
      秋元琢磨, Eli Barkai, Gunter Radons
    • Organizer
      日本物理学会第 77 回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] レーザー冷却過程における無限測度エルゴード理論2021

    • Author(s)
      秋元琢磨, Eli Barkai, Gunter Radons
    • Organizer
      日 本物理学会 2021 年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 過冷却液体における重心軌道から拡散状態の変化を検 出する手法2019

    • Author(s)
      秋元琢磨, 蜂谷優人, 畝山多加志, 金子敏宏
    • Organizer
      日本物理学会
    • Related Report
      2019 Research-status Report
  • [Presentation] First-Passage-Time Statistics in a Biased Quenched Trap Model2019

    • Author(s)
      Takuma Akimoto
    • Organizer
      Sino-German Bilateral Symposium Anomalous and Non-Ergodic Diffusion: Modeling, Theory, Application, and Simulation
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Infinite invariant measure in a heterogeneous diffusion process2019

    • Author(s)
      Takuma Akimoto
    • Organizer
      Research on the Theory of Random Dynamical Systems and Fractal Geometry
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 速度更新過程における無限測度と分布極限定理2019

    • Author(s)
      秋元琢磨, Eli Barkai, Guenter Radons
    • Organizer
      日本物 理学会第 74 回年次大会
    • Related Report
      2018 Research-status Report
  • [Remarks] Takuma Akimoto

    • URL

      https://akimototakuma.wordpress.com

    • Related Report
      2021 Annual Research Report
  • [Remarks] How does a protein shape affect its diffusivity?

    • URL

      https://www.youtube.com/watch?v=Ky_p1A9VS5c

    • Related Report
      2020 Research-status Report

URL: 

Published: 2018-04-23   Modified: 2023-01-30  

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