Impact of applied strain on the electron transport through ferroelectric tunnel junctions
Impact of applied strain on the electron transport through ferroelectric tunnel junctions
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DOI：
10.1063/1.3462070
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发表时间：
2010-07
影响因子：
4
通讯作者：
Xin Luo;S. P. Lin;Biao Wang;Yue Zheng
中科院分区：
文献类型：
--
作者：
Xin Luo;S. P. Lin;Biao Wang;Yue Zheng
结合非平衡格林函数和密度泛函理论，研究了外加应变场对Pt电极间铁电材料隧道电阻（TER）的影响。结果表明，应变诱导的对铁电相变对结的电子输运性质起着重要作用。当应变铁电结的TER比达到9000%时，其电阻有相当大的提高。详细分析表明，铁电势垒中Ti-O沿输运方向的位移改变了有效电位分布，导致铁电隧道结产生巨大的压电电阻。
Combining nonequilibrium Green’s functions with density-functional theory, we have investigated the effect of external strain field on the tunneling electroresistance (TER) of ferroelectric material sandwiched between Pt electrodes. The results show that the strain induced para/ferroelectric phase transitions play an important role in the electronic transport properties of the junction. Sizable enhancements in the resistance are found for the strained ferroelectric junctions with a TER ratio of 9000%. Detail analyses show that the Ti–O displacements along the transport direction in ferroelectric barrier change the effective potential profile, resulting in a giant piezoelectric resistance in the ferroelectric tunnel junctions.