Effect of Ferroelectricity on Electron Transport in Pt/BaTiO3/Pt Tunnel Junctions

Publication Year:
2007
Usage 1191
Downloads 1075
Abstract Views 116
Repository URL:
http://digitalcommons.unl.edu/cmrafacpub/20
Author(s):
Velev, Julian P.; Duan, Chun-gang; Belashchenko, Kirill D.; Jaswal, Sitaram; Tsymbal, Evgeny Y.
Tags:
Nanoscience and Nanotechnology
article description
Based on first-principles calculations, we demonstrate the impact of the electric polarization on electron transport in ferroelectric tunnel junctions (FTJs). Using a Pt/BaTiO3 /Pt FTJ as a model system, we show that the polarization of the BaTiO3 barrier leads to a substantial drop in the tunneling conductance due to changes in the electronic structure driven by ferroelectric displacements. We find a sizable change in the transmission probability across the Pt/BaTiO3 interface with polarization reversal, a signature of the electroresistance effect. These results reveal exciting prospects that FTJs offer as resistive switches in nanoscale electronic devices.