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arXiv 1002.1728cond-mat.mtrl-sci
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层状材料中的堆积和寄存器效应:六方氮化硼的例子

Stacking and Registry Effects in Layered Materials: The Case of Hexagonal Boron Nitride

Noa Marom, Jonathan Bernstein, Jonathan Garel, Alexandre Tkatchenko, Ernesto Joselevich, Leeor Kronik, Oded Hod

摘要:

采用van der Waals修正的密度泛函理论方法研究了六方氮化硼(h-BN)的层间滑移能谱.结果表明,范德华力的主要作用是将层间固定在一个固定的距离上,而静电力则决定了最佳的堆积模式和层间滑动能。一个几乎自由滑动的路径被确定,沿着该路径获得~0.6 eV的带隙调制。我们提出了一个简单的几何模型,量化层之间的注册表匹配,并捕捉波纹h-BN层间能量景观的本质。这种现象学模型的简单性为复杂的层状结构(如碳和氮化硼纳米管)的建模开辟了道路。

英文摘要:

The interlayer sliding energy landscape of hexagonal boron nitride (h-BN) is investigated via a van der Waals corrected density functional theory approach. It is found that the main role of the van der Waals forces is to "anchor" the layers at a fixed distance, whereas the electrostatic forces dictate the optimal stacking mode and the interlayer sliding energy. A nearly free-sliding path is identified, along which bandgap modulations of ~0.6 eV are obtained. We propose a simple geometrical model that quantifies the registry matching between the layers and captures the essence of the corrugated h-BN interlayer energy landscape. The simplicity of this phenomenological model opens the way to the modeling of complex layered structures, such as carbon and boron nitride nanotubes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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