Quantum confinement in transition metal oxide quantum wells

Choi, Miri; Lin, Chungwei; Butcher, Matthew; Posadas, Agham B.; Rodriguez, Cesar; Zollner, Stefan; He, Qian; Borisevich, Albina Y.

doi:10.1063/1.4921013

Title: Quantum confinement in transition metal oxide quantum wells

Journal Article · Mon May 11 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921013· OSTI ID:22399048

Choi, Miri; Lin, Chungwei; Butcher, Matthew; Posadas, Agham B.; Rodriguez, Cesar; Zollner, Stefan ^[1]; He, Qian; Borisevich, Albina Y. ^[2]

Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003 (United States)
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

We report on the quantum confinement in SrTiO{sub 3} (STO) quantum wells (QWs) grown by molecular beam epitaxy. The QW structure consists of LaAlO{sub 3} (LAO) and STO layers grown on LAO substrate. Structures with different QW thicknesses ranging from two to ten unit cells were grown and characterized. Optical properties (complex dielectric function) were measured by spectroscopic ellipsometry in the range of 1.0 eV–6.0 eV at room temperature. We observed that the absorption edge was blue-shifted by approximately 0.39 eV as the STO quantum well thickness was reduced to two unit cells. This demonstrates that the energy level of the first sub-band can be controlled by the QW thickness in a complex oxide material.

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OSTI ID:: 22399048

Journal Information:: Applied Physics Letters, Vol. 106, Issue 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951

Country of Publication:: United States

Language:: English

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Strain-induced indirect-to-direct bandgap transition in an np-type LaAlO ₃ /SrTiO ₃ (110) superlattice Wang, L.; Pan, W.; Hu, W. X. Physical Chemistry Chemical Physics, Vol. 21, Issue 13 https://doi.org/10.1039/c8cp07761d	journal	January 2019
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Designing near-infrared electro-optical devices from the SrTiO ₃ /LaAlO ₃ materials system Ortmann, J. Elliott; Duncan, Margaret A.; Demkov, Alexander A. Optical Materials Express, Vol. 9, Issue 7 https://doi.org/10.1364/ome.9.002982	journal	January 2019

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Title: Quantum confinement in transition metal oxide quantum wells

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