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Author Tao, L. L. ♦ Wang, J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ ASYMMETRY ♦ CONTROL ♦ ELECTRODES ♦ FERROELECTRIC MATERIALS ♦ FILMS ♦ LEAD COMPOUNDS ♦ LENGTH ♦ METALS ♦ POLARIZATION ♦ SCREENING ♦ TITANATES ♦ TRANSPORT THEORY ♦ TUNNEL EFFECT ♦ TUNNEL JUNCTIONS ♦ WORK FUNCTIONS
Abstract We report the investigation on the ferroelectricity and tunneling electroresistance (TER) effect in PbTiO{sub 3} (PTO)-based ferroelectric tunnel junctions (FTJs) using first-principles calculations. For symmetric FTJs, we have calculated the average polarizations of PTO film and effective screening lengths of different metal electrodes for a number of FTJs, which is useful for experimental research. For asymmetric FTJs, significant asymmetric ferroelectric displacements in PTO film are observed, which is attributed to the intrinsic field generated by the two dissimilar electrodes. Moreover, by performing quantum transport calculations on those asymmetric FTJs, a sizable TER effect is observed. It is found that the asymmetry of ferroelectric displacements in PTO barrier, which is determined by the difference of work functions of the electrodes, controls the observed TER effect. Our results will help unravel the TER mechanism of asymmetric FTJs in most experiments and will be useful for the designing of FTJ-based devices.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-14
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 119
Issue Number 22


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