Artificial two-dimensional polar metal at room temperature

Cao, Yanwei, Wang, Zhen, Park, Se Young, Yuan, Yakun, Liu, Xiaoran, Nikitin, Sergey M, Akamatsu, Hirofumi, Kareev, M, Middey, S, Meyers, D
et al (show 9 more authors) (2018) Artificial two-dimensional polar metal at room temperature. Nature Communications, 9 (1).

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<jats:title>Abstract</jats:title><jats:p>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 BaTiO<jats:sub>3</jats:sub>/SrTiO<jats:sub>3</jats:sub>/LaTiO<jats:sub>3</jats:sub>. 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.</jats:p>

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 30 Apr 2019 09:28
Last Modified: 19 Jan 2023 00:53
DOI: 10.1038/s41467-018-03964-9
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