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Artificial two-dimensional polar metal at room temperature

Author

Listed:
  • Yanwei Cao

    (Rutgers University
    Chinese Academy of Sciences)

  • Zhen Wang

    (Louisiana State University
    Brookhaven National Laboratory)

  • Se Young Park

    (University of California Berkeley)

  • Yakun Yuan

    (Pennsylvania State University)

  • Xiaoran Liu

    (Rutgers University)

  • Sergey M. Nikitin

    (Pennsylvania State University)

  • Hirofumi Akamatsu

    (Pennsylvania State University)

  • M. Kareev

    (Rutgers University)

  • S. Middey

    (University of Arkansas
    Indian Institute of Science)

  • D. Meyers

    (Brookhaven National Laboratory)

  • P. Thompson

    (European Synchrotron Radiation Facility)

  • P. J. Ryan

    (Argonne National Laboratory
    Dublin City University)

  • Padraic Shafer

    (Lawrence Berkeley National Laboratory)

  • A. N’Diaye

    (Lawrence Berkeley National Laboratory)

  • E. Arenholz

    (Lawrence Berkeley National Laboratory)

  • Venkatraman Gopalan

    (Pennsylvania State University)

  • Yimei Zhu

    (Brookhaven National Laboratory)

  • Karin M. Rabe

    (Rutgers University)

  • J. Chakhalian

    (Rutgers University)

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 favoring the polar structure 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 polar metal of the B-site type in tri-color (tri-layer) superlattices BaTiO3/SrTiO3/LaTiO3. A combination of atomic resolution scanning transmission electron microscopy with electron energy-loss spectroscopy, optical second harmonic generation, electrical transport, and first-principles calculations have revealed the microscopic mechanisms of periodic electric polarization, charge distribution, and orbital symmetry. Our results provide a route to creating all-oxide artificial non-centrosymmetric quasi-two-dimensional metals with exotic quantum states including coexisting ferroelectric, ferromagnetic, and superconducting phases.

Suggested Citation

  • Yanwei Cao & Zhen Wang & Se Young Park & Yakun Yuan & Xiaoran Liu & Sergey M. Nikitin & Hirofumi Akamatsu & M. Kareev & S. Middey & D. Meyers & P. Thompson & P. J. Ryan & Padraic Shafer & A. N’Diaye &, 2018. "Artificial two-dimensional polar metal at room temperature," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03964-9
    DOI: 10.1038/s41467-018-03964-9
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