Inelastic x-ray scattering in heterostructures: electronic excitations in LaAlO<inf>3</inf>/SrTiO<inf>3</inf>

Kari O. Ruotsalainen; Christoph J. Sahle; Tobias Ritschel; Jochen Geck; Masayuki Hosoda; Christopher Bell; Yasuyuki Hikita; Harold Y. Hwang; Tim T. Fister; Robert A. Gordon; Keijo Hämäläinen; Mikko Hakala; Simo Huotari; Chris Bell

doi:10.1088/0953-8984/27/33/335501

Inelastic x-ray scattering in heterostructures: electronic excitations in LaAlO<inf>3</inf>/SrTiO<inf>3</inf>

Kari O. Ruotsalainen, Christoph J. Sahle, Tobias Ritschel, Jochen Geck, Masayuki Hosoda, Christopher Bell, Yasuyuki Hikita, Harold Y. Hwang, Tim T. Fister, Robert A. Gordon, Keijo Hämäläinen, Mikko Hakala, Simo Huotari, Chris Bell

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Abstract

We present an investigation of the valence-electron excitation spectra including the collective plasmon modes of SrTiO<inf>3</inf>, LaAlO<inf>3</inf> and their heterostructures with non-resonant inelastic x-ray scattering. We analyse the spectra using calculations based on first principles and atomic multiplet models. We demonstrate the feasibility of performing valence IXS experiments in a total reflection geometry. Surprisingly, we find that the plasmon, interband and semicore excitations in multilayers are well described as a superposition of bulk-compound spectra even in a superstructure composing of layers of only one atomic layer thickness.

Original language	English
Article number	335501
Journal	Journal of Physics Condensed Matter
Volume	27
Issue number	33
DOIs	https://doi.org/10.1088/0953-8984/27/33/335501
Publication status	Published - 26 Aug 2015

Keywords

Electronic structure
Heterostructures
Inelastic x-ray scattering

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Ruotsalainen, K. O., Sahle, C. J., Ritschel, T., Geck, J., Hosoda, M., Bell, C., Hikita, Y., Hwang, H. Y., Fister, T. T., Gordon, R. A., Hämäläinen, K., Hakala, M., Huotari, S., & Bell, C. (2015). Inelastic x-ray scattering in heterostructures: electronic excitations in LaAlO<inf>3</inf>/SrTiO<inf>3</inf> Journal of Physics Condensed Matter, 27(33), [335501]. https://doi.org/10.1088/0953-8984/27/33/335501

@article{f4c82fe07deb4c8cbf8962ad3c2a2b40,

title = "Inelastic x-ray scattering in heterostructures: electronic excitations in LaAlO3/SrTiO3",

abstract = "We present an investigation of the valence-electron excitation spectra including the collective plasmon modes of SrTiO3, LaAlO3 and their heterostructures with non-resonant inelastic x-ray scattering. We analyse the spectra using calculations based on first principles and atomic multiplet models. We demonstrate the feasibility of performing valence IXS experiments in a total reflection geometry. Surprisingly, we find that the plasmon, interband and semicore excitations in multilayers are well described as a superposition of bulk-compound spectra even in a superstructure composing of layers of only one atomic layer thickness.",

keywords = "Electronic structure, Heterostructures, Inelastic x-ray scattering",

author = "Ruotsalainen, {Kari O.} and Sahle, {Christoph J.} and Tobias Ritschel and Jochen Geck and Masayuki Hosoda and Christopher Bell and Yasuyuki Hikita and Hwang, {Harold Y.} and Fister, {Tim T.} and Gordon, {Robert A.} and Keijo H{\"a}m{\"a}l{\"a}inen and Mikko Hakala and Simo Huotari and Chris Bell",

year = "2015",

month = aug,

day = "26",

doi = "10.1088/0953-8984/27/33/335501",

language = "English",

volume = "27",

journal = "Journal of Physics Condensed Matter",

issn = "0953-8984",

publisher = "IOP Publishing",

number = "33",

}

Ruotsalainen, KO, Sahle, CJ, Ritschel, T, Geck, J, Hosoda, M, Bell, C, Hikita, Y, Hwang, HY, Fister, TT, Gordon, RA, Hämäläinen, K, Hakala, M, Huotari, S & Bell, C 2015, 'Inelastic x-ray scattering in heterostructures: electronic excitations in LaAlO<inf>3</inf>/SrTiO<inf>3</inf>', Journal of Physics Condensed Matter, vol. 27, no. 33, 335501. https://doi.org/10.1088/0953-8984/27/33/335501

TY - JOUR

T1 - Inelastic x-ray scattering in heterostructures

T2 - electronic excitations in LaAlO3/SrTiO3

AU - Ruotsalainen, Kari O.

AU - Sahle, Christoph J.

AU - Ritschel, Tobias

AU - Geck, Jochen

AU - Hosoda, Masayuki

AU - Bell, Christopher

AU - Hikita, Yasuyuki

AU - Hwang, Harold Y.

AU - Fister, Tim T.

AU - Gordon, Robert A.

AU - Hämäläinen, Keijo

AU - Hakala, Mikko

AU - Huotari, Simo

AU - Bell, Chris

PY - 2015/8/26

Y1 - 2015/8/26

N2 - We present an investigation of the valence-electron excitation spectra including the collective plasmon modes of SrTiO3, LaAlO3 and their heterostructures with non-resonant inelastic x-ray scattering. We analyse the spectra using calculations based on first principles and atomic multiplet models. We demonstrate the feasibility of performing valence IXS experiments in a total reflection geometry. Surprisingly, we find that the plasmon, interband and semicore excitations in multilayers are well described as a superposition of bulk-compound spectra even in a superstructure composing of layers of only one atomic layer thickness.

AB - We present an investigation of the valence-electron excitation spectra including the collective plasmon modes of SrTiO3, LaAlO3 and their heterostructures with non-resonant inelastic x-ray scattering. We analyse the spectra using calculations based on first principles and atomic multiplet models. We demonstrate the feasibility of performing valence IXS experiments in a total reflection geometry. Surprisingly, we find that the plasmon, interband and semicore excitations in multilayers are well described as a superposition of bulk-compound spectra even in a superstructure composing of layers of only one atomic layer thickness.

KW - Electronic structure

KW - Heterostructures

KW - Inelastic x-ray scattering

UR - http://www.scopus.com/inward/record.url?scp=84938768082&partnerID=8YFLogxK

U2 - 10.1088/0953-8984/27/33/335501

DO - 10.1088/0953-8984/27/33/335501

M3 - Article (Academic Journal)

C2 - 26221981

VL - 27

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 33

M1 - 335501

ER -

Inelastic x-ray scattering in heterostructures: electronic excitations in LaAlO<inf>3</inf>/SrTiO<inf>3</inf>

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