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Title: Quantum confinement in transition metal oxide quantum wells

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] ; ;  [3]
  1. Department of Physics, The University of Texas at Austin, Austin, Texas 78712 (United States)
  2. Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003 (United States)
  3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Publication Date:
OSTI Identifier:
22399048
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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