Two-dimensional confinement of 3d1 electrons in LaTiO3/LaAlO3 multilayers

S. S.A. Seo; M. J. Han; G. W.J. Hassink; W. S. Choi; S. J. Moon; J. S. Kim; T. Susaki; Y. S. Lee; J. Yu; C. Bernhard; H. Y. Hwang; G. Rijnders; D. H.A. Blank; B. Keimer; T. W. Noh

doi:10.1103/PhysRevLett.104.036401

Two-dimensional confinement of 3d1 electrons in LaTiO3/LaAlO3 multilayers

S. S.A. Seo, M. J. Han, G. W.J. Hassink, W. S. Choi, S. J. Moon, J. S. Kim, T. Susaki, Y. S. Lee, J. Yu, C. Bernhard, H. Y. Hwang, G. Rijnders, D. H.A. Blank, B. Keimer, T. W. Noh

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Abstract

We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of (LaTiO3)n(LaAlO3)5 multilayers with n=1-3. These provide direct information about the electronic structure of the two-dimensional (2D) 3d1 state of the Ti ions. In combination with local density approximation, including a Hubbard U calculation, we suggest that 2D confinement in the TiO2 slabs lifts the degeneracy of the t2g states leaving only the planar dxy orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t2g 2D Hubbard model.

Original language	English
Article number	036401
Journal	Physical Review Letters
Volume	104
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.104.036401
State	Published - Jan 19 2010

ASJC Scopus subject areas

General Physics and Astronomy

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Seo, S. S. A., Han, M. J., Hassink, G. W. J., Choi, W. S., Moon, S. J., Kim, J. S., Susaki, T., Lee, Y. S., Yu, J., Bernhard, C., Hwang, H. Y., Rijnders, G., Blank, D. H. A., Keimer, B., & Noh, T. W. (2010). Two-dimensional confinement of 3d1 electrons in LaTiO3/LaAlO3 multilayers. Physical Review Letters, 104(3), Article 036401. https://doi.org/10.1103/PhysRevLett.104.036401

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title = "Two-dimensional confinement of 3d1 electrons in LaTiO3/LaAlO3 multilayers",

abstract = "We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of (LaTiO3)n(LaAlO3)5 multilayers with n=1-3. These provide direct information about the electronic structure of the two-dimensional (2D) 3d1 state of the Ti ions. In combination with local density approximation, including a Hubbard U calculation, we suggest that 2D confinement in the TiO2 slabs lifts the degeneracy of the t2g states leaving only the planar dxy orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t2g 2D Hubbard model.",

author = "Seo, {S. S.A.} and Han, {M. J.} and Hassink, {G. W.J.} and Choi, {W. S.} and Moon, {S. J.} and Kim, {J. S.} and T. Susaki and Lee, {Y. S.} and J. Yu and C. Bernhard and Hwang, {H. Y.} and G. Rijnders and Blank, {D. H.A.} and B. Keimer and Noh, {T. W.}",

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doi = "10.1103/PhysRevLett.104.036401",

language = "English",

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T1 - Two-dimensional confinement of 3d1 electrons in LaTiO3/LaAlO3 multilayers

AU - Seo, S. S.A.

AU - Han, M. J.

AU - Hassink, G. W.J.

AU - Choi, W. S.

AU - Moon, S. J.

AU - Kim, J. S.

AU - Susaki, T.

AU - Lee, Y. S.

AU - Yu, J.

AU - Bernhard, C.

AU - Hwang, H. Y.

AU - Rijnders, G.

AU - Blank, D. H.A.

AU - Keimer, B.

AU - Noh, T. W.

PY - 2010/1/19

Y1 - 2010/1/19

N2 - We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of (LaTiO3)n(LaAlO3)5 multilayers with n=1-3. These provide direct information about the electronic structure of the two-dimensional (2D) 3d1 state of the Ti ions. In combination with local density approximation, including a Hubbard U calculation, we suggest that 2D confinement in the TiO2 slabs lifts the degeneracy of the t2g states leaving only the planar dxy orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t2g 2D Hubbard model.

AB - We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of (LaTiO3)n(LaAlO3)5 multilayers with n=1-3. These provide direct information about the electronic structure of the two-dimensional (2D) 3d1 state of the Ti ions. In combination with local density approximation, including a Hubbard U calculation, we suggest that 2D confinement in the TiO2 slabs lifts the degeneracy of the t2g states leaving only the planar dxy orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t2g 2D Hubbard model.

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Two-dimensional confinement of 3d1 electrons in LaTiO3/LaAlO3 multilayers

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