Quantum confinement in transition metal oxide quantum wells
- Univ. of Texas, Austin, TX (United States). Dept. of Physics
- New Mexico State Univ., Las Cruces, NM (United States). Dept. of Physics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
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.
- Research Organization:
- 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 Organization:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR); Texas Advanced Computing Center (United States); National Science Foundation (NSF)
- DOE Contract Number:
- AC05-00OR22725; SC0001091; SC0008877; FA9550-12-10494; DMR-1104934
- OSTI ID:
- 1265592
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 19; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
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