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arXiv math-ph/0511057math-phmath.MPmath.SP
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具有磁场的周期量子图的Cantor谱和能带谱

Cantor and band spectra for periodic quantum graphs with magnetic fields

Jochen Bruening, Vladimir Geyler, Konstantin Pankrashkin

摘要:

我们提供了一个详尽的频谱分析的二维周期正方形图格子与磁场。我们表明,频谱由Dirichlet特征值的边缘和一个特定的离散算子下的判别式(李雅普诺夫函数)的一个合适的Kronig-Penney哈密顿谱的原像。特别地,在任意两个狄利克雷本征值之间的谱对于无理通量是康托集,并且对于有理通量是绝对连续的并且具有能带结构。狄利克雷特征值可以是孤立的或嵌入的,取决于参数的选择。两种可能性的条件。我们表明,一般有无限多的差距,在这种情况下,贝特-索末菲猜想失败。

英文摘要:

We provide an exhaustive spectral analysis of the two-dimensional periodic square graph lattice with a magnetic field. We show that the spectrum consists of the Dirichlet eigenvalues of the edges and of the preimage of the spectrum of a certain discrete operator under the discriminant (Lyapunov function) of a suitable Kronig-Penney Hamiltonian. In particular, between any two Dirichlet eigenvalues the spectrum is a Cantor set for an irrational flux, and is absolutely continuous and has a band structure for a rational flux. The Dirichlet eigenvalues can be isolated or embedded, subject to the choice of parameters. Conditions for both possibilities are given. We show that generically there are infinitely many gaps in the spectrum, and the Bethe-Sommerfeld conjecture fails in this case.

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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