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Orbital engineering in symmetry-breaking polar heterostructures.

Publication ,  Journal Article
Disa, AS; Kumah, DP; Malashevich, A; Chen, H; Arena, DA; Specht, ED; Ismail-Beigi, S; Walker, FJ; Ahn, CH
Published in: Physical review letters
January 2015

We experimentally demonstrate a novel approach to substantially modify orbital occupations and symmetries in electronically correlated oxides. In contrast to methods using strain or confinement, this orbital tuning is achieved by exploiting charge transfer and inversion symmetry breaking using atomically layered heterostructures. We illustrate the technique in the LaTiO_{3}-LaNiO_{3}-LaAlO_{3} system; a combination of x-ray absorption spectroscopy and ab initio theory reveals electron transfer and concomitant polar fields, resulting in a ∼50% change in the occupation of Ni d orbitals. This change is sufficiently large to remove the orbital degeneracy of bulk LaNiO_{3} and creates an electronic configuration approaching a single-band Fermi surface. Furthermore, we theoretically show that such three-component heterostructuring is robust and tunable by choice of insulator in the heterostructure, providing a general method for engineering orbital configurations and designing novel electronic systems.

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Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

January 2015

Volume

114

Issue

2

Start / End Page

026801

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

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Disa, A. S., Kumah, D. P., Malashevich, A., Chen, H., Arena, D. A., Specht, E. D., … Ahn, C. H. (2015). Orbital engineering in symmetry-breaking polar heterostructures. Physical Review Letters, 114(2), 026801. https://doi.org/10.1103/physrevlett.114.026801
Disa, Ankit S., Divine P. Kumah, Andrei Malashevich, Hanghui Chen, Dario A. Arena, Eliot D. Specht, Sohrab Ismail-Beigi, F. J. Walker, and Charles H. Ahn. “Orbital engineering in symmetry-breaking polar heterostructures.Physical Review Letters 114, no. 2 (January 2015): 026801. https://doi.org/10.1103/physrevlett.114.026801.
Disa AS, Kumah DP, Malashevich A, Chen H, Arena DA, Specht ED, et al. Orbital engineering in symmetry-breaking polar heterostructures. Physical review letters. 2015 Jan;114(2):026801.
Disa, Ankit S., et al. “Orbital engineering in symmetry-breaking polar heterostructures.Physical Review Letters, vol. 114, no. 2, Jan. 2015, p. 026801. Epmc, doi:10.1103/physrevlett.114.026801.
Disa AS, Kumah DP, Malashevich A, Chen H, Arena DA, Specht ED, Ismail-Beigi S, Walker FJ, Ahn CH. Orbital engineering in symmetry-breaking polar heterostructures. Physical review letters. 2015 Jan;114(2):026801.

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

January 2015

Volume

114

Issue

2

Start / End Page

026801

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences