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arXiv 1009.0922math-phmath.APmath.MP
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周期薛定谔算子的亏损模与均匀化

Defect Modes and Homogenization of Periodic Schrödinger Operators

M. A. Hoefer, M. I. Weinstein

摘要:

我们考虑算子$H_\eps=-Δ+V(\x)+\eps^2Q(\eps\x)$的离散本征值,其中$V(\x)$是周期的,$Q(\y)$是定域在$\R^d,\ \ d\ge1$上的.对于$\eps>0$和足够小的,离散的特征值可以从周期薛定谔算子$H_0 = -Δ_\x+V(\x)$的谱带边缘分叉(出现)到谱隙。分岔的性质取决于均匀化薛定谔算子$L_{A,Q}=-\nabla_\y\cdot A \nabla_\y +\ Q(\y)$。这里,$A$表示与谱带边缘相关的逆有效质量矩阵,谱带边缘是分叉的位置。

英文摘要:

We consider the discrete eigenvalues of the operator $H_\eps=-Δ+V(\x)+\eps^2Q(\eps\x)$, where $V(\x)$ is periodic and $Q(\y)$ is localized on $\R^d,\ \ d\ge1$. For $\eps>0$ and sufficiently small, discrete eigenvalues may bifurcate (emerge) from spectral band edges of the periodic Schrödinger operator, $H_0 = -Δ_\x+V(\x)$, into spectral gaps. The nature of the bifurcation depends on the homogenized Schrödinger operator $L_{A,Q}=-\nabla_\y\cdot A \nabla_\y +\ Q(\y)$. Here, $A$ denotes the inverse effective mass matrix, associated with the spectral band edge, which is the site of the bifurcation.

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