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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.

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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