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
Pages (from-to)	036401
Journal	Physical review letters
Volume	104
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.104.036401
Publication status	Published - 2010

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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), 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.",

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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

Y1 - 2010

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.

U2 - 10.1103/PhysRevLett.104.036401

DO - 10.1103/PhysRevLett.104.036401

M3 - Article

SN - 0031-9007

VL - 104

SP - 036401

JO - Physical review letters

JF - Physical review letters

IS - 3

ER -

Two-Dimensional Confinement of 3d1 Electrons in LaTiO3/LaAlO3 Multilayers

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Two-Dimensional Confinement of 3d¹ Electrons in LaTiO₃/LaAlO₃ Multilayers