Quantum confinement of Mott electrons in ultrathin LaNiO 3/LaAlO3 superlattices

Jian Liu; S. Okamoto; M. Van Veenendaal; M. Kareev; B. Gray; P. Ryan; J. W. Freeland; J. Chakhalian

doi:10.1103/PhysRevB.83.161102

Quantum confinement of Mott electrons in ultrathin LaNiO ₃/LaAlO₃ superlattices

Jian Liu, S. Okamoto, M. Van Veenendaal, M. Kareev, B. Gray, P. Ryan, J. W. Freeland, J. Chakhalian

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Abstract

We investigate the electronic reconstruction in (LaNiO₃) _n/(LaAlO₃)₃ (n=3, 5, and 10) superlattices due to the quantum confinement (QC) by dc transport and resonant soft x-ray absorption spectroscopy. In proximity to the QC limit, a Mott-type transition from an itinerant electron behavior to a localized state is observed. The system exhibits tendency toward charge-order during the transition. Ab initio cluster calculations are in good agreement with the absorption spectra, indicating that the apical ligand hole density is highly suppressed, resulting in a strong modification of the electronic structure. At the dimensional crossover cellular dynamical-mean-field calculations support the emergence of a Mott insulator ground state in the heterostructured ultrathin slab of LaNiO₃.

Original language	English
Article number	161102
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.83.161102
State	Published - Apr 13 2011

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title = "Quantum confinement of Mott electrons in ultrathin LaNiO 3/LaAlO3 superlattices",

abstract = "We investigate the electronic reconstruction in (LaNiO3) n/(LaAlO3)3 (n=3, 5, and 10) superlattices due to the quantum confinement (QC) by dc transport and resonant soft x-ray absorption spectroscopy. In proximity to the QC limit, a Mott-type transition from an itinerant electron behavior to a localized state is observed. The system exhibits tendency toward charge-order during the transition. Ab initio cluster calculations are in good agreement with the absorption spectra, indicating that the apical ligand hole density is highly suppressed, resulting in a strong modification of the electronic structure. At the dimensional crossover cellular dynamical-mean-field calculations support the emergence of a Mott insulator ground state in the heterostructured ultrathin slab of LaNiO3.",

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T1 - Quantum confinement of Mott electrons in ultrathin LaNiO 3/LaAlO3 superlattices

AU - Liu, Jian

AU - Okamoto, S.

AU - Van Veenendaal, M.

AU - Kareev, M.

AU - Gray, B.

AU - Ryan, P.

AU - Freeland, J. W.

AU - Chakhalian, J.

PY - 2011/4/13

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N2 - We investigate the electronic reconstruction in (LaNiO3) n/(LaAlO3)3 (n=3, 5, and 10) superlattices due to the quantum confinement (QC) by dc transport and resonant soft x-ray absorption spectroscopy. In proximity to the QC limit, a Mott-type transition from an itinerant electron behavior to a localized state is observed. The system exhibits tendency toward charge-order during the transition. Ab initio cluster calculations are in good agreement with the absorption spectra, indicating that the apical ligand hole density is highly suppressed, resulting in a strong modification of the electronic structure. At the dimensional crossover cellular dynamical-mean-field calculations support the emergence of a Mott insulator ground state in the heterostructured ultrathin slab of LaNiO3.

AB - We investigate the electronic reconstruction in (LaNiO3) n/(LaAlO3)3 (n=3, 5, and 10) superlattices due to the quantum confinement (QC) by dc transport and resonant soft x-ray absorption spectroscopy. In proximity to the QC limit, a Mott-type transition from an itinerant electron behavior to a localized state is observed. The system exhibits tendency toward charge-order during the transition. Ab initio cluster calculations are in good agreement with the absorption spectra, indicating that the apical ligand hole density is highly suppressed, resulting in a strong modification of the electronic structure. At the dimensional crossover cellular dynamical-mean-field calculations support the emergence of a Mott insulator ground state in the heterostructured ultrathin slab of LaNiO3.

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DO - 10.1103/PhysRevB.83.161102

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JF - Physical Review B - Condensed Matter and Materials Physics

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Quantum confinement of Mott electrons in ultrathin LaNiO ₃/LaAlO₃ superlattices

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