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Title: Quantum confinement in transition metal oxide quantum wells

Abstract

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.

Authors:
; ; ; ; ;  [1]; ;  [2]
  1. Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003 (United States)
  2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Publication Date:
OSTI Identifier:
22399048
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ALUMINATES; APPROXIMATIONS; DIELECTRIC MATERIALS; ELLIPSOMETRY; ENERGY LEVELS; EV RANGE; LANTHANUM OXIDES; LAYERS; MOLECULAR BEAM EPITAXY; OPTICAL PROPERTIES; QUANTUM WELLS; STRONTIUM TITANATES; SUBSTRATES; TEMPERATURE RANGE 0273-0400 K; THICKNESS

Citation Formats

Choi, Miri, Lin, Chungwei, Butcher, Matthew, Posadas, Agham B., Demkov, Alexander A., E-mail: demkov@physics.utexas.edu, Rodriguez, Cesar, Zollner, Stefan, He, Qian, and Borisevich, Albina Y. Quantum confinement in transition metal oxide quantum wells. United States: N. p., 2015. Web. doi:10.1063/1.4921013.
Choi, Miri, Lin, Chungwei, Butcher, Matthew, Posadas, Agham B., Demkov, Alexander A., E-mail: demkov@physics.utexas.edu, Rodriguez, Cesar, Zollner, Stefan, He, Qian, & Borisevich, Albina Y. Quantum confinement in transition metal oxide quantum wells. United States. https://doi.org/10.1063/1.4921013
Choi, Miri, Lin, Chungwei, Butcher, Matthew, Posadas, Agham B., Demkov, Alexander A., E-mail: demkov@physics.utexas.edu, Rodriguez, Cesar, Zollner, Stefan, He, Qian, and Borisevich, Albina Y. 2015. "Quantum confinement in transition metal oxide quantum wells". United States. https://doi.org/10.1063/1.4921013.
@article{osti_22399048,
title = {Quantum confinement in transition metal oxide quantum wells},
author = {Choi, Miri and Lin, Chungwei and Butcher, Matthew and Posadas, Agham B. and Demkov, Alexander A., E-mail: demkov@physics.utexas.edu and Rodriguez, Cesar and Zollner, Stefan and He, Qian and Borisevich, Albina Y.},
abstractNote = {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.},
doi = {10.1063/1.4921013},
url = {https://www.osti.gov/biblio/22399048}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 19,
volume = 106,
place = {United States},
year = {Mon May 11 00:00:00 EDT 2015},
month = {Mon May 11 00:00:00 EDT 2015}
}

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Works referencing / citing this record:

Large positive linear magnetoresistance in the two-dimensional t 2g electron gas at the EuO/SrTiO3 interface
journal, May 2018


Strain-induced indirect-to-direct bandgap transition in an np-type LaAlO 3 /SrTiO 3 (110) superlattice
journal, January 2019


Monolithic integration of transition metal oxide multiple quantum wells on silicon (001)
journal, April 2019


Designing near-infrared electro-optical devices from the SrTiO 3 /LaAlO 3 materials system
journal, January 2019