Spectra of magnetic chain graphs: coupling constant perturbations

Spectra of magnetic chain graphs: coupling constant perturbations
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磁链图谱:耦合常数扰动

DOI:
10.1088/1751-8113/48/12/125302
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发表时间:
2014
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
S. Manko
S. Manko
中科院分区:
--
文献类型:
--
作者:
P. Exner;S. Manko

文献摘要

被引文献

相似文献

我们分析了在垂直于图平面的均匀磁场作用下,具有δ耦合的环链形式的量子图的谱特性。在链呈现平移对称的情况下,我们求出了能带谱,并研究了由于改变有限数目的顶点耦合常数而导致的能隙中的离散谱。特别是,我们详细讨论了一些例子,如一个或两个顶点的扰动,弱扰动渐近性,以及一对距离扰动。
We analyze spectral properties of a quantum graph in the form of a ring chain with a δ coupling in the vertices exposed to a homogeneous magnetic field perpendicular to the graph plane. We find the band spectrum in the case when the chain exhibits a translational symmetry and study the discrete spectrum in the gaps resulting from changing a finite number of vertex coupling constants. In particular, we discuss in detail some examples such as perturbations of one or two vertices, weak perturbation asymptotics, and a pair of distant perturbations.