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Ouellette, Daniel Gerald.

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Dynamical conductivity of strongly correlated electron systems at oxide interfaces.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Dynamical conductivity of strongly correlated electron systems at oxide interfaces./
Author:	Ouellette, Daniel Gerald.
Description:	223 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-03(E), Section: B.
Contained By:	Dissertation Abstracts International75-03B(E).
Subject:	Physics, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3602181
ISBN:	9781303540066

Dynamical conductivity of strongly correlated electron systems at oxide interfaces.
Ouellette, Daniel Gerald.

Dynamical conductivity of strongly correlated electron systems at oxide interfaces. - 223 p.

Source: Dissertation Abstracts International, Volume: 75-03(E), Section: B.

Thesis (Ph.D.)--University of California, Santa Barbara, 2013.

The Mott metal-insulator transition (MIT) in transition-metal complex oxides results from strong electron-electron interactions and is accompanied by a rich spectrum of phenomena, including magnetic, charge, and orbital ordering, superconductivity, structural distortions, polarons, and very high-density 2-dimensional interface electron liquids. Recent advances in oxide heteroepitaxy allow interface control as a promising new approach to tuning the exotic properties of materials near the quantum critical point, with potential application to technologies including phase-change electronics, high power transistors, and sensors. The dynamical conductivity of oxide heterostructures is measured using a combination of terahertz time-domain spectroscopy, Fourier transform infrared spectroscopy, and dc magnetotransport. The rare-earth nickelates RNiO3 (R = La, Nd...) exhibit a temperature and bandwidth controlled MIT in bulk. Measurements of the Drude response in epitaxial thin films provide quantification of the strain-dependent mass enhancement in the metallic phase due to strong correlations. Reduction of LaNiO 3 film thickness leads to additional mass renormalization attributed to structural distortions at the heteroepitaxial interface, and an MIT is observed depending on the interfacing materials in coherent perovskite heterostructures. The rare-earth titanates RTiO3 exhibit a bandwidth and band filling controlled Mott MIT. Furthermore, the heterointerface between Mott insulating GdTiO3 and band insulating SrTiO3 exhibits a 2-dimensional itinerant electron liquid, with extremely high sheet densities of 3 x 1014 cm-2. The dynamical conductivity of the interface electrons is analyzed in terms of subband-dependent electron mobility and the established large polaron dynamics in bulk SrTiO3. Additional confinement of the electron liquids is achieved by decreasing the SrTiO3 layer thickness, with attendant increase in the dynamical mass. Taking the confinement to its extreme limit, a single (GdO) + plane in Mott insulating GdTiO3 is replaced with a (SrO) 0 plane. This is equivalent to "delta-doping" the Mott insulator with an extremely high density sheet of holes. The transport and absorption in the resulting two-dimensional insulator are consistent with a simple model of small polaron hopping. A comparison is made to similar features in the conductivity of randomly doped Sr1-xGdxTiO3 films.

ISBN: 9781303540066Subjects--Topical Terms:

1018488
Physics, General.

Dynamical conductivity of strongly correlated electron systems at oxide interfaces.
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100 1 $a Ouellette, Daniel Gerald. $3 2095221
245 1 0 $a Dynamical conductivity of strongly correlated electron systems at oxide interfaces.
300 $a 223 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-03(E), Section: B.
500 $a Adviser: S. James Allen.
502 $a Thesis (Ph.D.)--University of California, Santa Barbara, 2013.
520 $a The Mott metal-insulator transition (MIT) in transition-metal complex oxides results from strong electron-electron interactions and is accompanied by a rich spectrum of phenomena, including magnetic, charge, and orbital ordering, superconductivity, structural distortions, polarons, and very high-density 2-dimensional interface electron liquids. Recent advances in oxide heteroepitaxy allow interface control as a promising new approach to tuning the exotic properties of materials near the quantum critical point, with potential application to technologies including phase-change electronics, high power transistors, and sensors. The dynamical conductivity of oxide heterostructures is measured using a combination of terahertz time-domain spectroscopy, Fourier transform infrared spectroscopy, and dc magnetotransport. The rare-earth nickelates RNiO3 (R = La, Nd...) exhibit a temperature and bandwidth controlled MIT in bulk. Measurements of the Drude response in epitaxial thin films provide quantification of the strain-dependent mass enhancement in the metallic phase due to strong correlations. Reduction of LaNiO 3 film thickness leads to additional mass renormalization attributed to structural distortions at the heteroepitaxial interface, and an MIT is observed depending on the interfacing materials in coherent perovskite heterostructures. The rare-earth titanates RTiO3 exhibit a bandwidth and band filling controlled Mott MIT. Furthermore, the heterointerface between Mott insulating GdTiO3 and band insulating SrTiO3 exhibits a 2-dimensional itinerant electron liquid, with extremely high sheet densities of 3 x 1014 cm-2. The dynamical conductivity of the interface electrons is analyzed in terms of subband-dependent electron mobility and the established large polaron dynamics in bulk SrTiO3. Additional confinement of the electron liquids is achieved by decreasing the SrTiO3 layer thickness, with attendant increase in the dynamical mass. Taking the confinement to its extreme limit, a single (GdO) + plane in Mott insulating GdTiO3 is replaced with a (SrO) 0 plane. This is equivalent to "delta-doping" the Mott insulator with an extremely high density sheet of holes. The transport and absorption in the resulting two-dimensional insulator are consistent with a simple model of small polaron hopping. A comparison is made to similar features in the conductivity of randomly doped Sr1-xGdxTiO3 films.
590 $a School code: 0035.
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650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Optics. $3 1018756
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690 $a 0752
710 2 $a University of California, Santa Barbara. $b Physics. $3 1020469
773 0 $t Dissertation Abstracts International $g 75-03B(E).
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792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3602181