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).
1547-.
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 BaTiO<sub>3</sub>/SrTiO<sub>3</sub>/LaTiO<sub>3</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.
| Item Type: | Article |
|---|---|
| Depositing User: | Symplectic Admin |
| Date Deposited: | 30 Apr 2019 09:28 |
| Last Modified: | 15 Mar 2024 10:27 |
| DOI: | 10.1038/s41467-018-03964-9 |
| Open Access URL: | https://doi.org/10.1038/s41467-018-03964-9 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3039028 |
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