Materials Research Science and Engineering Center: Faculty Publications
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Document Type
Article
Date of this Version
6-24-2005
Abstract
The interplay between the electron transport in metal-ferroelectric-metal junctions with ultrathin ferroelectric barriers and the polarization state of a barrier is investigated. Using a model which takes into account screening of polarization charges in metallic electrodes and direct quantum tunneling across a ferroelectric barrier, we calculate the change in the tunneling conductance associated with the polarization switching. We find the conductance change of a few orders of magnitude for metallic electrodes with significantly different screening lengths. This giant electroresistance effect is the consequence of a different potential profile seen by transport electrons for the two opposite polarization orientations.
Comments
Published in Physical Review Letters 94, 246802 (2005). URL: http://link.aps.org/abstract/PRL/v94/e246802 DOI: 10.1103/PhysRevLett.94.246802 Copyright 2005 American Physical Society. Used by permission.