Quantum confinement in transition metal oxide quantum wells
Abstract
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. This demonstrates that the energy level of the first sub-band can be controlled by the QW thickness in a complex oxide material.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 11, 2015
- Source ID
- 10.1063/1.4921013
Entities
People
- Agham Posadas
- Albina Y. Borisevich
- Alexander A Demkov
- Cesar Rodriguez
- Chungwei Lin
- Matthew Butcher
- Miri Choi
- Qian He
- Stefan Zollner
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- New Mexico State University
- Oak Ridge National Laboratory
- University of Texas at Austin