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2019 Fiscal Year Annual Research Report

Magnetotransport in strongly correlated non-centrosymmetric f-electron materials

Publicly Offered Research

Project AreaJ-Physics: Physics of conductive multipole systems
Project/Area Number 18H04316
Research InstitutionKyoto University

Principal Investigator

Peters Robert  京都大学, 理学研究科, 講師 (80734293)

Project Period (FY) 2018-04-01 – 2020-03-31
Keywordsnoncentro symmetric f / Rashba interaction / magnetism / Kondo effect / exceptional points
Outline of Annual Research Achievements

In the last year, we have focused on the interplay between the Kondo effect and magnetic properties (1) and at the influence of a Rashba-like hybridization on the emergence of exceptional points (2) in non-centrosymmetric f-electron materials.
(1) As commonly known in f-electron materials, the magnetic phase competes with the paramagnetic phase dominated by the Kondo effect. In non-centrosymmetric f-electron materials, the Rashba interaction affects both phases by splitting the electronic bands for different spin-directions. We found that the Rashba interaction can strengthen the antiferromagnetic phase in these materials. An antiferromagnetic phase is formed in the non-centrosymmetric system even for hybridization strengths, for which in the centrosymmetric system, the Kondo effect dominates, and a paramagnetic phase is formed. Most strikingly, we found that this antiferromagnetic phase with strong Rashba interaction is metallic, and we were able to show that this metallic antiferromagnetic phase exhibits a strong magnetoelectric effect, which can be used for spintronics devices.
(2) In a second project, we have analyzed the emergence of exceptional points in f-electron materials with Rashba-like hybridization. We have demonstrated that the exceptional points can occur in these materials, which are connected by Fermi arcs. Furthermore, we have shown that there are complex manifolds of exceptional points in the combined space of momentum and energy, which change their shape when the temperature is increased or decreased.

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

  • Research Products

    (8 results)

All 2020 2019

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

  • [Journal Article] Relationship between exceptional points and the Kondo effect in f-electron materials2020

    • Author(s)
      Michishita Yoshihiro、Yoshida Tsuneya、Peters Robert
    • Journal Title

      Physical Review B

      Volume: 101 Pages: 085122-1 9

    • DOI

      10.1103/PhysRevB.101.085122

    • Peer Reviewed
  • [Journal Article] Hubbard model on the honeycomb lattice: From static and dynamical mean-field theories to lattice quantum Monte Carlo simulations2020

    • Author(s)
      Raczkowski Marcin、Peters Robert、Ph?ng Th? Thu、Takemori Nayuta、Assaad Fakher F.、Honecker Andreas、Vahedi Javad
    • Journal Title

      Physical Review B

      Volume: 101 Pages: 125103-1 12

    • DOI

      10.1103/PhysRevB.101.125103

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quantum oscillations in strongly correlated topological Kondo insulators2019

    • Author(s)
      Peters Robert、Yoshida Tsuneya、Kawakami Norio
    • Journal Title

      Physical Review B

      Volume: 100 Pages: 085124-1 11

    • DOI

      10.1103/PhysRevB.100.085124

    • Peer Reviewed
  • [Journal Article] Impact of the Rashba spin-orbit coupling on f-electron materials2019

    • Author(s)
      Michishita Yoshihiro、Peters Robert
    • Journal Title

      Physical Review B

      Volume: 99 Pages: 155141-1 11

    • DOI

      10.1103/PhysRevB.99.155141

    • Peer Reviewed
  • [Presentation] Numerical Renormalization Group in DMFT: Application to topological Kondo insulators2019

    • Author(s)
      Robert Peters
    • Organizer
      DMFT meeting in Shizuoka
    • Invited
  • [Presentation] Exceptional Points in the Spectrum of a Topological Kondo Insulator2019

    • Author(s)
      Robert Peters
    • Organizer
      SCES 2019
    • Int'l Joint Research
  • [Presentation] Quantum oscillations in topological Kondo insulators2019

    • Author(s)
      Robert Peters
    • Organizer
      Correlation days (Dresden Germany)
    • Int'l Joint Research
  • [Presentation] Quantum oscillations in topological Kondo insulators2019

    • Author(s)
      Robert Peters
    • Organizer
      Gordon conference on topology and correlations
    • Int'l Joint Research

URL: 

Published: 2021-01-27  

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