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arXiv 0907.4942hep-thcond-mat.mes-hallgr-qc
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平行平板在紧致尺度下的费米Casimir效应及其在纳米管中的应用

Fermionic Casimir effect for parallel plates in the presence of compact dimensions with applications to nanotubes

S. Bellucci, A. A. Saharian

摘要:

本文在闵可夫斯基时空的背景下,计算了两平行板几何中大质量费米子场的Casimir能量和力,其中空间维数为任意数量的环面紧化空间维数。袋边界条件施加在板和周期性条件与任意阶段被认为是沿紧凑的尺寸。Casimir能量被分解为纯拓扑、单板和相互作用三部分。在周期性条件下,Casimir能量的相互作用部分总是负的,与紧致维数的长度和相位无关。为了得到合力,必须考虑板两侧的贡献。然后,来自真空能量的拓扑部分的力相互抵消,只有相互作用项对卡西米尔力有贡献。给出了一般公式在Kaluza-Klein型模型和碳纳米管中的应用。特别是,我们表明,对于有限长度的金属纳米管的Casimir力作用在管的边缘总是有吸引力的,而对于双折射型的,他们是有吸引力的小长度的纳米管和排斥的大长度。

英文摘要:

We evaluate the Casimir energy and force for a massive fermionic field in the geometry of two parallel plates on background of Minkowski spacetime with an arbitrary number of toroidally compactified spatial dimensions. The bag boundary conditions are imposed on the plates and periodicity conditions with arbitrary phases are considered along the compact dimensions. The Casimir energy is decomposed into purely topological, single plate and interaction parts. With independence of the lengths of the compact dimensions and the phases in the periodicity conditions, the interaction part of the Casimir energy is always negative. In order to obtain the resulting force, the contributions from both sides of the plates must be taken into account. Then, the forces coming from the topological parts of the vacuum energy cancel out and only the interaction term contributes to the Casimir force. Applications of the general formulae to Kaluza-Klein type models and carbon nanotubes are given. In particular, we show that for finite length metallic nanotubes the Casimir forces acting on the tube edges are always attractive, whereas for semiconducting-type ones they are attractive for small lengths of the nanotube and repulsive for large lengths.

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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