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

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.

doi:10.1063/1.4991956

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

Journal Article · Mon Oct 02 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4991956· OSTI ID:1418361

^[1]; Zhou, H. ^[2]; Paudel, T. R. ^[3];

^[1];

^[1]; Bark, C. W. ^[1]; Lee, D. ^[1]; Kim, T. H. ^[1]; Fong, D. D. ^[2]; Rzchowski, M. S. ^[1]; Tsymbal, E. Y. ^[3]; Eom, C. B. ^[1]

Univ. of Wisconsin-Madison, Madison, WI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Nebraska, Lincoln, NE (United States)

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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: 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

Grant/Contract Number:: AC02-06CH11357; FG02-06ER46327

OSTI ID:: 1418361

Alternate ID(s):: OSTI ID: 1396065

Journal Information:: Applied Physics Letters, Vol. 111, Issue 14; ISSN 0003-6951

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

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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