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arXiv 0909.1500cond-mat.mtrl-sci
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氧化物-氧化物界面极性不连续性的Berry相理论

Berry-phase theory of polar discontinuities at oxide-oxide interfaces

Massimiliano Stengel, David Vanderbilt

摘要:

在现代极化理论的框架内,我们严格地建立了电位移场D的微观性质。特别是,我们表明,纵向分量D是保存在一个连贯的和绝缘的接口。为了激发和阐明我们的推导,我们使用的例子LAO/STO接口和超晶格,上述守恒定律的有效性不是立即明显的。我们的结果将约束D密度泛函理论的“定域性原理”推广到电荷失配系统的第一性原理模拟中。

英文摘要:

In the framework of the modern theory of polarization, we rigorously establish the microscopic nature of the electric displacement field D. In particular, we show that the longitudinal component of D is preserved at a coherent and insulating interface. To motivate and elucidate our derivation, we use the example of LAO/STO interfaces and superlattices, where the validity of the above conservation law is not immediately obvious. Our results generalize the "locality principle" of constrained-D density functional theory to the first-principles modeling of charge-mismatched systems.

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