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Title: In-situ probing of coupled atomic restructuring and metallicity of oxide heterointerfaces induced by polar adsorbates

Abstract

Microscopic understanding of the surface-controlled conductivity of the two dimensional electron gas at complex oxide interfaces is crucial for developing functional interfaces. We observe conductivity and structural modification using in-situ synchrotron surface x-ray diffraction as the surface of a model LaAlO 3/SrTiO 3 (001) heterostructure is changed by polar adsorbates. We find that polar adsorbate-induced interfacial metallicity reduces polar distortions in the LaAlO 3 layer. First-principles density functional theory calculations show that surface dipoles introduced by polar adsorbates lead to additional charge transfer and the reduction of polar displacements in the LaAlO 3 layer, consistent with the experimental observations. Our study supports that internal structural deformations controlling functionalities can be driven without the application of direct electrical or thermal bias and offers a route to tuning interfacial properties. Furthermore, these results also highlight the important role of in-situ x-ray scattering with atomic resolution in capturing and exploring structural distortions and charge density changes caused by external perturbations such as chemical adsorption, redox reaction, and generation and/or annihilation of surface defects.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [2];  [1];  [3];  [1]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
OSTI Identifier:
1418361
Alternate Identifier(s):
OSTI ID: 1396065
Grant/Contract Number:  
AC02-06CH11357; FG02-06ER46327
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 14; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Adsorption; Chemical compounds; Heterointerfaces; Heterojunctions; Synchrotrons

Citation Formats

Ryu, S., Zhou, H., Paudel, T. R., Irwin, J., Podkaminer, J. P., Bark, C. W., Lee, D., Kim, T. H., Fong, D. D., Rzchowski, M. S., Tsymbal, E. Y., and Eom, C. B. In-situ probing of coupled atomic restructuring and metallicity of oxide heterointerfaces induced by polar adsorbates. United States: N. p., 2017. Web. doi:10.1063/1.4991956.
Ryu, S., Zhou, H., Paudel, T. R., Irwin, J., Podkaminer, J. P., Bark, C. W., Lee, D., Kim, T. H., Fong, D. D., Rzchowski, M. S., Tsymbal, E. Y., & Eom, C. B. In-situ probing of coupled atomic restructuring and metallicity of oxide heterointerfaces induced by polar adsorbates. United States. doi:10.1063/1.4991956.
Ryu, S., Zhou, H., Paudel, T. R., Irwin, J., Podkaminer, J. P., Bark, C. W., Lee, D., Kim, T. H., Fong, D. D., Rzchowski, M. S., Tsymbal, E. Y., and Eom, C. B. Mon . "In-situ probing of coupled atomic restructuring and metallicity of oxide heterointerfaces induced by polar adsorbates". United States. doi:10.1063/1.4991956. https://www.osti.gov/servlets/purl/1418361.
@article{osti_1418361,
title = {In-situ probing of coupled atomic restructuring and metallicity of oxide heterointerfaces induced by polar adsorbates},
author = {Ryu, S. and Zhou, H. and Paudel, T. R. and Irwin, J. and Podkaminer, J. P. and Bark, C. W. and Lee, D. and Kim, T. H. and Fong, D. D. and Rzchowski, M. S. and Tsymbal, E. Y. and Eom, C. B.},
abstractNote = {Microscopic understanding of the surface-controlled conductivity of the two dimensional electron gas at complex oxide interfaces is crucial for developing functional interfaces. We observe conductivity and structural modification using in-situ synchrotron surface x-ray diffraction as the surface of a model LaAlO3/SrTiO3 (001) heterostructure is changed by polar adsorbates. We find that polar adsorbate-induced interfacial metallicity reduces polar distortions in the LaAlO3 layer. First-principles density functional theory calculations show that surface dipoles introduced by polar adsorbates lead to additional charge transfer and the reduction of polar displacements in the LaAlO3 layer, consistent with the experimental observations. Our study supports that internal structural deformations controlling functionalities can be driven without the application of direct electrical or thermal bias and offers a route to tuning interfacial properties. Furthermore, these results also highlight the important role of in-situ x-ray scattering with atomic resolution in capturing and exploring structural distortions and charge density changes caused by external perturbations such as chemical adsorption, redox reaction, and generation and/or annihilation of surface defects.},
doi = {10.1063/1.4991956},
journal = {Applied Physics Letters},
number = 14,
volume = 111,
place = {United States},
year = {2017},
month = {10}
}

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