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arXiv 1709.07583cond-mat.mes-hallcond-mat.mtrl-sci
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各向异性拓扑绝缘体平板间的范德华力矩和力

Van der Waals torque and force between anisotropic topological insulator slabs

Bing-Sui Lu

摘要:

我们研究了两个共面和介电各向异性的拓扑绝缘体(TI)平板之间的范德华(vdW)扭矩和力的特性,其中平板的光轴都垂直于平板间隙界面的法线方向,并且通常彼此取向不同。我们发现,除了磁电耦合强度,各向异性也可以影响vdW力的符号,即,如果各向异性充分增加,则排斥vdW力可以变为吸引力。此外,vdW力作为TI板的光轴之间的角度差的函数振荡,对于为$π$的整数(半整数)倍的角度差,vdW力是最排斥/最不吸引(最不排斥/最吸引)的。我们的第三个发现是,TI板的VDW扭矩一般比普通介质板弱。我们的工作提供了第一个实例,其中矢量势出现在计算的vdW相互作用的限制是非延迟或静态的。

英文摘要:

We investigate the character of the van der Waals (vdW) torque and force between two coplanar and dielectrically anisotropic topological insulator (TI) slabs separated by a vacuum gap in the non-retardation regime, where the optic axes of the slabs are each perpendicular to the normal direction to the slab-gap interface and also generally differently oriented from each other. We find that in addition to the magnetoelectric coupling strength, the anisotropy can also influence the sign of the vdW force, viz., a repulsive vdW force can become attractive if the anistropy is increased sufficiently. In addition, the vdW force oscillates as a function of the angular difference between the optic axes of the TI slabs, being most repulsive/least attractive (least repulsive/most attractive) for angular differences that are integer (half-integer) multiples of $π$. Our third finding is that the vdW torque for TI slabs is generally weaker than that for ordinary dielectric slabs. Our work provides the first instance in which the vector potential appears in a calculation of the vdW interaction for which the limit is non-retarded or static.

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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