Artificial two-dimensional polar metal at room temperature

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, E. Arenholz, Venkatraman Gopalan, Yimei Zhu, Karin Rabe, Jak Chakhalian

Research output: Contribution to journalArticle

12 Citations (Scopus)

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.

Original languageEnglish (US)
Article number1547
JournalNature communications
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2018

Fingerprint

Metals
Temperature
room temperature
metals
Electron Energy-Loss Spectroscopy
Scanning Transmission Electron Microscopy
Electron energy loss spectroscopy
Charge distribution
Superlattices
Harmonic generation
Static Electricity
conduction electrons
Oxides
charge distribution
Ferroelectric materials
metallicity
superlattices
harmonic generations
Color
energy dissipation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Cao, Yanwei ; Wang, Zhen ; Park, Se Young ; Yuan, Yakun ; Liu, Xiaoran ; Nikitin, Sergey M. ; Akamatsu, Hirofumi ; Kareev, M. ; Middey, S. ; Meyers, D. ; Thompson, P. ; Ryan, P. J. ; Shafer, Padraic ; N'Diaye, A. ; Arenholz, E. ; Gopalan, Venkatraman ; Zhu, Yimei ; Rabe, Karin ; Chakhalian, Jak. / Artificial two-dimensional polar metal at room temperature. In: Nature communications. 2018 ; Vol. 9, No. 1.
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Cao, Y, Wang, Z, Park, SY, Yuan, Y, Liu, X, Nikitin, SM, Akamatsu, H, Kareev, M, Middey, S, Meyers, D, Thompson, P, Ryan, PJ, Shafer, P, N'Diaye, A, Arenholz, E, Gopalan, V, Zhu, Y, Rabe, K & Chakhalian, J 2018, 'Artificial two-dimensional polar metal at room temperature', Nature communications, vol. 9, no. 1, 1547. https://doi.org/10.1038/s41467-018-03964-9

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.; Thompson, P.; Ryan, P. J.; Shafer, Padraic; N'Diaye, A.; Arenholz, E.; Gopalan, Venkatraman; Zhu, Yimei; Rabe, Karin; Chakhalian, Jak.

In: Nature communications, Vol. 9, No. 1, 1547, 01.12.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Artificial two-dimensional polar metal at room temperature

AU - Cao, Yanwei

AU - Wang, Zhen

AU - Park, Se Young

AU - Yuan, Yakun

AU - Liu, Xiaoran

AU - Nikitin, Sergey M.

AU - Akamatsu, Hirofumi

AU - Kareev, M.

AU - Middey, S.

AU - Meyers, D.

AU - Thompson, P.

AU - Ryan, P. J.

AU - Shafer, Padraic

AU - N'Diaye, A.

AU - Arenholz, E.

AU - Gopalan, Venkatraman

AU - Zhu, Yimei

AU - Rabe, Karin

AU - Chakhalian, Jak

PY - 2018/12/1

Y1 - 2018/12/1

N2 - 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.

AB - 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.

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Cao Y, Wang Z, Park SY, Yuan Y, Liu X, Nikitin SM et al. Artificial two-dimensional polar metal at room temperature. Nature communications. 2018 Dec 1;9(1). 1547. https://doi.org/10.1038/s41467-018-03964-9