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arXiv 1808.01577hep-thcond-mat.mes-hallgr-qc
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拓扑非平凡膜世界中的费米子流

Fermionic currents in topologically nontrivial braneworlds

S. Bellucci, A. A. Saharian, D. H. Simonyan, V. V. Vardanyan

摘要:

研究了在具有任意数量的超环面紧维的局域AdS时空背景下,在恒定规范场存在的情况下,膜对带电费米子场电流密度真空期望值的影响.沿着紧维,场算符服从具有任意相位的拟周期性条件,在膜上,场算符受袋边界条件的约束。电荷密度和电流密度沿非紧凑维度的分量的VEV消失。沿紧维的分量被分解成膜自由和膜诱导的贡献。后者的行为在各种渐近区域的参数进行了研究。特别地,它表明,膜诱导的贡献主要位于膜附近,并在AdS边界和视界上消失。一个重要的特征是膜上电流密度的有限性。应用程序给出了$Z_2$ -对称branewlords的Randall-Sundrum型紧尺寸的两类边界条件的费米子场。在三维时空的特殊情况下,将相应的结果应用于研究封闭磁通量对弯曲石墨烯管中诱导的基态电流密度的边缘效应.

英文摘要:

We investigate the influence of a brane on the vacuum expectation value (VEV) of the current density for a charged fermionic field in background of locally AdS spacetime with an arbitrary number of toroidally compact dimensions and in the presence of a constant gauge field. Along compact dimensions the field operator obeys quasiperiodicity conditions with arbitrary phases and on the brane it is constrained by the bag boundary condition. The VEVs for the charge density and the components of the current density along uncompact dimensions vanish. The components along compact dimensions are decomposed into the brane-free and brane-induced contributions. The behavior of the latter in various asymptotic regions of the parameters is investigated. It particular, it is shown that the brane-induced contribution is mainly located near the brane and vanishes on the AdS boundary and on the horizon. An important feature is the finiteness of the current density on the brane. Applications are given to $Z_2$-symmetric braneworlds of the Randall-Sundrum type with compact dimensions for two classes of boundary conditions on the fermionic field. In the special case of three-dimensional spacetime, the corresponding results are applied for the investigation of the edge effects on the ground state current density induced in curved graphene tubes by an enclosed magnetic flux.

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