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Title: Quantum confinement in transition metal oxide quantum wells

Abstract

In this paper, we report on the quantum confinement in SrTiO 3 (STO) quantum wells (QWs) grown by molecular beam epitaxy. The QW structure consists of LaAlO 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. Finally, 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];  [1];  [1];  [2];  [3];  [1];  [3]; ORCiD logo [2];  [1]
  1. Univ. of Texas, Austin, TX (United States). Dept. of Physics
  2. New Mexico State Univ., Las Cruces, NM (United States). Dept. of Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Understanding Charge Separation and Transfer at Interfaces in Energy Materials (CST); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Air Force Office of Scientific Research (AFOSR); Texas Advanced Computing Center (United States); National Science Foundation (NSF)
OSTI Identifier:
1265592
DOE Contract Number:  
AC05-00OR22725; SC0001091; SC0008877; FA9550-12-10494; DMR-1104934
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 19; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Choi, Miri, Lin, Chungwei, Butcher, Matthew, Rodriguez, Cesar, He, Qian, Posadas, Agham B., Borisevich, Albina Y., Zollner, Stefan, and Demkov, Alexander A. 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, Rodriguez, Cesar, He, Qian, Posadas, Agham B., Borisevich, Albina Y., Zollner, Stefan, & Demkov, Alexander A. Quantum confinement in transition metal oxide quantum wells. United States. doi:10.1063/1.4921013.
Choi, Miri, Lin, Chungwei, Butcher, Matthew, Rodriguez, Cesar, He, Qian, Posadas, Agham B., Borisevich, Albina Y., Zollner, Stefan, and Demkov, Alexander A. Mon . "Quantum confinement in transition metal oxide quantum wells". United States. doi:10.1063/1.4921013.
@article{osti_1265592,
title = {Quantum confinement in transition metal oxide quantum wells},
author = {Choi, Miri and Lin, Chungwei and Butcher, Matthew and Rodriguez, Cesar and He, Qian and Posadas, Agham B. and Borisevich, Albina Y. and Zollner, Stefan and Demkov, Alexander A.},
abstractNote = {In this paper, we report on the quantum confinement in SrTiO3 (STO) quantum wells (QWs) grown by molecular beam epitaxy. The QW structure consists of LaAlO3 (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. Finally, 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},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 19,
volume = 106,
place = {United States},
year = {2015},
month = {5}
}

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