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Microscopic model for the ferroelectric field effect in oxide heterostructures

机译:氧化物异质结构中铁电场效应的微观模型

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摘要

A microscopic model Hamiltonian for the ferroelectric field effect is introduced for the study of oxide heterostructures with ferroelectric components. The long-range Coulomb interaction is incorporated as an electrostatic potential, solved self-consistently together with the charge distribution. A generic double-exchange system is used as the conducting channel, epitaxially attached to the ferroelectric gate. The observed ferroelectric screening effect, namely, the charge accumulation/depletion near the interface, is shown to drive interfacial phase transitions that give rise to robust magnetoelectric responses and bipolar resistive switching, in qualitative agreement with previous density functional theory calculations. The model can be easily adapted to other materials by modifying the Hamiltonian of the conducting channel, and it is useful in simulating ferroelectric field effect devices particularly those involving strongly correlated electronic components where ab initio techniques are difficult to apply.
机译:介绍了一种用于铁电场效应的微观模型哈密顿量,用于研究具有铁电成分的氧化物异质结构。远程库仑相互作用作为静电势合并,与电荷分布一起自洽地解决。通用的双交换系统用作导电通道,外延连接到铁电栅极。与先前的密度泛函理论计算在质量上达成一致,观察到的铁电屏蔽效应,即界面附近的电荷积累/耗尽,将驱动界面相变,从而产生稳健的磁电响应和双极电阻切换。通过修改传导通道的哈密顿量,该模型可以轻松地适用于其他材料,并且在模拟铁电场效应器件(特别是那些涉及从头算技术难以应用的强相关电子组件的器件)中非常有用。

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  • 来源
    《Physical review》 |2011年第15期|p.155117.1-155117.8|共8页
  • 作者单位

    Department of Physics, Southeast University, Nanjing 211189, China,National Laboratory of Solid State Micro structures, Nanjing University, Nanjing 210093, China;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA,Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    National Laboratory of Solid State Micro structures, Nanjing University, Nanjing 210093, China,International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China;

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA,Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    field effect devices; manganites; ferroelectricity and antiferroelectricity; spin polarized field effect transistors;

    机译:场效应器件;锰矿;铁电和反铁电自旋极化场效应晶体管;

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