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Interfacial symmetry-breaking effects in the quantum paraelectric SrTiO3
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Zhang, Hang-Bo and Alexe, Marin (2023) Interfacial symmetry-breaking effects in the quantum paraelectric SrTiO3. Physical Review Applied, 19 (1). 014028. doi:10.1103/physrevapplied.19.014028 ISSN 2331-7019.
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Official URL: https://doi.org/10.1103/physrevapplied.19.014028
Abstract
Oxides lacking a center of symmetry are highly desired, as they usually have fascinating physical properties. However, there are limited numbers of noncentrosymmetric media in nature and most of them do not have multiple functionalities integrated. Here, using the bulk photovoltaic effect as the probing technique, we demonstrate that, at interfaces with a wide range of oxides, strontium titanate (SrTiO3) is polar, i.e., with broken inversion symmetry in the quantum paraelectric phase. Studies comprising conductivity and the bulk photovoltaic effect on LaAlO3/SrTiO3 thin films further show that excessive electronic band bending screens the induced polarity, revealing that appropriate band bending at the interface is the key parameter to control symmetry breaking. Inheriting high carrier mobility from SrTiO3, the polar interface under illumination at low temperatures is conductive or metallic, permitting multifunctionality coupling between the oxides and SrTiO3. Our studies show that significant photovoltaic effects can be generated at the polar interfaces, especially in the quantum-paraelectric phase of SrTiO3, thus giving practical design strategies for multifunctional devices.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
SWORD Depositor: | Library Publications Router | ||||||
Journal or Publication Title: | Physical Review Applied | ||||||
Publisher: | American Physical Society (APS) | ||||||
ISSN: | 2331-7019 | ||||||
Official Date: | 9 January 2023 | ||||||
Dates: |
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Volume: | 19 | ||||||
Number: | 1 | ||||||
Article Number: | 014028 | ||||||
DOI: | 10.1103/physrevapplied.19.014028 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Copyright Holders: | © 2023 American Physical Society | ||||||
Date of first compliant deposit: | 15 March 2023 | ||||||
Date of first compliant Open Access: | 15 March 2023 | ||||||
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