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arXiv 1011.3133math-phcond-mat.mes-hallmath.APmath.MPmath.SP
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同心Neumann圆Dirichlet波导的光谱和局域化特性

Spectral and localization properties of the Dirichlet wave guide with two concentric Neumann discs

Hatem Najar, Oleg Olendski

摘要:

研究了生活在宽度为$d$的三维直条上的量子粒子的哈密顿量的束缚态。我们施加Neumann边界条件的两个同心窗口的半径$a$和$ b$位于相对的墙壁和Dirichlet边界条件的其余部分的边界带。我们证明了这样的系统具有离散的特征值低于任何$a,b>0$的本质谱。当$a$和$b$趋于无穷大时,得到了特征值的渐近解.与单窗口情况下的比较分析表明,由于额外的可能性的调节能谱的反交叉结构建立作为一个功能的内半径与其尖锐度增加较大的外半径。对所得结果给出了数学和物理解释,即反交叉伴随着波函数局域化的剧烈变化。平行画到其他结构表现出类似的现象,特别是,它被证明,相反的二维几何,在临界诺依曼半径真正的束缚态存在。

英文摘要:

Bound states of the Hamiltonian describing a quantum particle living on three dimensional straight strip of width $d$ are investigated. We impose the Neumann boundary condition on the two concentric windows of the radii $a$ and $ b$ located on the opposite walls and the Dirichlet boundary condition on the remaining part of the boundary of the strip. We prove that such a system exhibits discrete eigenvalues below the essential spectrum for any $a,b>0$. When $a$ and $b$ tend to the infinity, the asymptotic of the eigenvalue is derived. A comparative analysis with the one-window case reveals that due to the additional possibility of the regulating energy spectrum the anticrossing structure builds up as a function of the inner radius with its sharpness increasing for the larger outer radius. Mathematical and physical interpretation of the obtained results is presented; namely, it is derived that the anticrossings are accompanied by the drastic changes of the wave function localization. Parallels are drawn to the other structures exhibiting similar phenomena; in particular, it is proved that, contrary to the two-dimensional geometry, at the critical Neumann radii true bound states exist.

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