Correlated Oxide Dirac Semimetal in the Qantum Limit

ORAL  · Invited

Abstract

Quantum materials with strong correlation and non-trivial topology are indispensable to next-generation technologies. Exploitation of topological band structure is an ideal starting point to realize correlated topological QMs. In this talk, I will introduce recent discovery of strain-induced correlated topological phase in strained SrNbO3 films. Dirac electrons in strained SrNbO3 films revealed ultra-high mobility (μmax ≈ 100,000 cm2/Vs), exceptionally small effective mass (m* ~ 0.04me), and non-zero Berry phase. More importantly, strained SrNbO3 films reached the extreme quantum limit, exhibiting a sign of fractional quantum states and giant mass enhancement. Our results suggest that symmetry modified SrNbO3 is a rare example of correlated topological QMs, in which strong correlation of Dirac electrons led the realization of fractional occupation of Landau levels

*This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, and in part by the Computational Materials Sciences Program. The high–magnetic field measurements were performed at the National High Magnetic Field Laboratory, which is supported by NSF cooperative agreement no. DMR-1644779 and the state of Florida. This research used resources of the Advanced Photon Source, a DOE Office of Science User Facility, operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357. Extraordinary facility operations were supported, in part, by the DOE Office of Science through the National Virtual Biotechnology Laboratory, a consortium of DOE national laboratories focused on the response to COVID-19, with funding provided by the Coronavirus CARES Act.

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Publication: Sci. Adv. 7, eabf9631 (2021)

Presenters

  • Jong Mok Ok

    • Oak Ridge National Lab
    • Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea

Authors

  • Jong Mok Ok

    • Oak Ridge National Lab
    • Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea

  • Narayan Mohanta

    • Oak Ridge National Lab

  • Jie Zhang

    • Oak Ridge National Lab

  • Sangmoon Yoon

    • Oak Ridge National Laboratory

  • Satoshi Okamoto

    • Oak Ridge National Lab

  • Eun Sang Choi

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
    • National High Magnetic Field Laboratory and Department of Physics, Florida State University

  • Hua Zhou

    • Argonne National Laboratory

  • Megan K Briggeman

    • University of Pittsburgh

  • Patrick R Irvin

    • University of Pittsburgh

  • Andrew R Lupini

    • Oak Ridge National Lab

  • Yun-Yi Pai

    • Oak Ridge National Lab

  • Elizabeth Skoropata

    • Paul Scherrer Institute

  • Changhee Sohn

    • UNIST

  • Haoxiang Li

    • Oak Ridge National Lab

  • Hu Miao

    • Oak Ridge National Labs

  • Benjamin J Lawrie

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Woo Seok Choi

    • Department of Physics, Sungkyunkwan University

  • Gyula Eres

    • Oak Ridge National Lab

  • Jeremy Levy

    • University of Pittsburgh
    • University of Pittsburgh, Department of Physics and Astronomy, Pittsburgh, PA 15260, USA

  • Ho Nyung Lee

    • Oak Ridge National Lab