Artificial two-dimensional ferroelectric metal at room temperature

ORAL

Abstract

Polar metals, commonly defined by the coexistence of polar crystal structure and metallicity, are thought to be scarce because the long-range electrostatic fields are expected to be fully screened by the conduction electrons of a metal. Moreover, reducing from three to two dimensions, it remains an open question whether a polar metal can exist. Here we report on the realization of a room temperature two-dimensional ferroelectric metal in a tri-color superlattice BaTiO3/SrTiO3/LaTiO3. A combination of advanced probes and DFT calculations have revealed the microscopic mechanisms of unusual periodic electric polarization, charge distribution, and orbital symmetry. Our results provide a route to create all-oxide artificial non-centrosymmetric quasi-two-dimensional metals with exotic quantum and topological states including potentially coexisting ferroelectric, ferromagnetic, and superconducting phases.

*This work was supported by the Gordon and Betty Moore Foundation EPiQS Initiative (GBMF4534).

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Presenters

  • Mikhail Kareev

    • Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Rutgers University

Authors

  • Mikhail Kareev

    • Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Rutgers University

  • Yanwei Cao

    • Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
    • Rutgers University

  • Zhen Wang

    • Louisiana State University, Baton Rouge
    • Louisiana State University

  • Se Young Park

    • University of California Berkeley, Berkeley

  • Yakun Yuan

    • University of California, Los Angeles
    • Materials Science and Engineering, Pennsylvania State University
    • Pennsylvania State University

  • Xiaoran Liu

    • Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Rutgers University

  • Sergey M Nikitin

    • Pennsylvania State University

  • Hirofumi Akamatsu

    • Pennsylvania State University

  • Derek Meyers

    • University of California, Berkeley
    • Brookhaven National Laboratory
    • Oklahoma State University

  • Srimanta Middey

    • Department of Physics, Indian Institute of Science
    • Indian Institute of Science

  • Paul Thompson

    • European Synchrotron Radiation Facility

  • Philip Ryan

    • APS, Argonne National Laboratory
    • APS, Argonne National Labs
    • Argonne National Laboratory

  • Padriac Shafer

    • Lawrence Berkeley National Laboratory

  • Alpha T. N'Diaye

    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Adv Light Source LBL

  • Elke Arenholz

    • Lawrence Berkeley National Laboratory
    • Cornell High Energy Synchrotron Source, Cornell University

  • Venkatraman Gopalan

    • Pennsylvania State University

  • Yimei Zhu

    • Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • Brookhaven National Lab
    • Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Department of Energy Science and Technology, Brookhaven National Laboratory

  • Karin M Rabe

    • Department of Physics and Astronomy, Rutgers University, New Brunswick, NJ, USA
    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
    • Dept. of Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, United States
    • Department of Physics and Astronomy, Rutgers University, New Brunswick

  • Jak Chakhalian

    • Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Rutgers University