Interface control of bulk ferroelectric polarization

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The control of material interfaces at the atomic level has led to novel interfacial properties and functionalities. In particular, the study of polar discontinuities at interfaces between complex oxides lies at the frontier of modern condensed matter research. Here we employ a combination of experimental measurements and theoretical calculations to demonstrate the control of a bulk property, namely ferroelectric polarization, of a heteroepitaxial bilayer by precise atomic-scale interface engineering. More specifically, the control is achieved by exploiting the interfacial valence mismatch to influence the electrostatic potential step across the interface, which manifests itself as the biased-voltage in ferroelectric hysteresis loops and determines the ferroelectric state. A broad study of diverse systems comprising different ferroelectrics and conducting perovskite underlayers extends the generality of this phenomenon.
Publisher
NATL ACAD SCIENCES
Issue Date
2012-06
Language
English
Article Type
Article
Keywords

KAPPA GATE DIELECTRICS; SRTIO3/LAALO3 INTERFACES; OXIDE INTERFACES; HETEROSTRUCTURES; RECONSTRUCTION; SUPERLATTICES; MODULATION; TRANSISTOR; SURFACES; PHYSICS

Citation

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.109, no.25, pp.9710 - 9715

ISSN
0027-8424
DOI
10.1073/pnas.1117990109
URI
http://hdl.handle.net/10203/96901
Appears in Collection
PH-Journal Papers(저널논문)
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