Spectra of magnetic chain graphs: coupling constant perturbations
Spectra of magnetic chain graphs: coupling constant perturbations
复制标题
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:
影响因子:
--
通讯作者:
S. Manko
中科院分区:
文献类型:
--
作者:
P. Exner;S. Manko
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.