Quantum confinement in transition metal oxide quantum wells

Choi, Miri; Lin, Chungwei; Butcher, Matthew; Rodriguez, Cesar; He, Qian; Posadas, Agham B.; Borisevich, Albina Y.; Zollner, Stefan; Demkov, Alexander A.

doi:10.1063/1.4921013

Title: Quantum confinement in transition metal oxide quantum wells

Journal Article · Mon May 11 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921013· OSTI ID:1370054

Choi, Miri ^[1]; Lin, Chungwei ^[1]; Butcher, Matthew ^[1]; Rodriguez, Cesar ^[2]; He, Qian ^[3]; Posadas, Agham B. ^[1]; Borisevich, Albina Y. ^[3];

^[2]; Demkov, Alexander A. ^[1]

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 & Technology Division

Here, 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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Understanding Charge Separation and Transfer at Interfaces in Energy Materials (CST)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)

Grant/Contract Number:: SC0001091

OSTI ID:: 1370054

Journal Information:: Applied Physics Letters, Vol. 106, Issue 19; Related Information: CST partners with University of Texas at Austin (lead); Sandia National Laboratories; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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