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Charge expulsion,charge inhomogeneity, and phase separation in dynamic Hubbard models

机译:动态Hubbard模型中的电荷排出,电荷不均匀和相分离

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摘要

Dynamic Hubbard models are extensions of the conventional Hubbard model that take into account the fact that atomic orbitals expand upon double occupancy.It is shown here that systems described by dynamic Hubbard models have a tendency to expel negative charge from their interior to the surface and to develop charge inhomogeneity and even phase separation in the bulk.These effects are associated with a lowering of the electronic kinetic energy.We propose that these models may explain the charge inhomogeneity and negatively charged grain boundaries observed in cuprate oxides and other materials.
机译:动态Hubbard模型是传统Hubbard模型的扩展,它考虑了原子轨道在双重占据下扩展的事实,在此表明动态Hubbard模型描述的系统倾向于将负电荷从其内部释放到表面,并向表面释放。这些效应与电子动能的降低有关。我们认为,这些模型可以解释在铜酸盐氧化物和其他材料中观察到的电荷不均匀性和带负电的晶界。

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  • 来源
    《Physical review》 |2013年第18期|184506.1-184506.12|共12页
  • 作者

    J.E.Hirsch;

  • 作者单位

    Department of Physics, University of California, San Diego, La Jolla, California 92093-0319, USA;

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  • 正文语种 eng
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