Quantum confinement in transition metal oxide quantum wells

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

doi:10.1063/1.4921013

Quantum confinement in transition metal oxide quantum wells

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

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

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.

Original language	English
Article number	192902
Journal	Applied Physics Letters
Volume	106
Issue number	19
DOIs	https://doi.org/10.1063/1.4921013
State	Published - May 11 2015

Access to Document

10.1063/1.4921013

Cite this

@article{881139af90924f5f9fed758df3c96ce1,

title = "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.",

author = "Miri Choi and Chungwei Lin and Matthew Butcher and Cesar Rodriguez and Qian He and Posadas, {Agham B.} and Borisevich, {Albina Y.} and Stefan Zollner and Demkov, {Alexander A.}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = may,

day = "11",

doi = "10.1063/1.4921013",

language = "English",

volume = "106",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "19",

}

TY - JOUR

T1 - Quantum confinement in transition metal oxide quantum wells

AU - Choi, Miri

AU - Lin, Chungwei

AU - Butcher, Matthew

AU - Rodriguez, Cesar

AU - He, Qian

AU - Posadas, Agham B.

AU - Borisevich, Albina Y.

AU - Zollner, Stefan

AU - Demkov, Alexander A.

PY - 2015/5/11

Y1 - 2015/5/11

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84929224256&partnerID=8YFLogxK

U2 - 10.1063/1.4921013

DO - 10.1063/1.4921013

M3 - Article

AN - SCOPUS:84929224256

SN - 0003-6951

VL - 106

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 19

M1 - 192902

ER -

Quantum confinement in transition metal oxide quantum wells

Abstract

Access to Document

Other files and links

Fingerprint

Cite this