Sharp spectral transition for eigenvalues embedded into the spectral bands of perturbed periodic operators

Sharp spectral transition for eigenvalues embedded into the spectral bands of perturbed periodic operators
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嵌入扰动周期算子谱带中的特征值的急剧谱转变

DOI:
10.1007/s11854-020-0111-x
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发表时间:
2020
期刊:
Journal d'Analyse Mathématique
影响因子:
--
通讯作者:
Ong, Darren C.
Ong, Darren C.
中科院分区:
--
文献类型:
--
作者:
Liu, Wencai;Ong, Darren C.

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本文考虑薛定谔方程,其中V_0(x)是1-周期的,V(x)是衰减微扰.根据Floquet理论,H 0 = − V2 + V0的谱是纯绝对连续的,并且由闭区间(通常称为谱带)的并集组成。给定H_0的任意谱带的任意有限点集满足一个温和的非共振条件,构造光滑函数使得H = H_0 + V有特征值.给定Ho的任意谱带中的任意可数点集{Ej}服从相同的非共振条件,且任意函数h(x)> 0任意缓慢地趋于无穷远,我们构造光滑函数使得H = H 0 + V有特征值{Ej}.另一方面,我们证明了当x趋于无穷大时,H = H_0 + V_n的特征值不嵌入谱带中。我们还证明了Jacobi算子的一个类似结果。
In this paper, we consider the Schrödinger equation,whereV0(x) is 1-periodic andV(x) is a decaying perturbation. By Floquet theory, the spectrum ofH0= − ∇2+V0is purely absolutely continuous and consists of a union of closed intervals (often referred to as spectral bands). Given any finite set of pointsin any spectral band ofH0obeying a mild non-resonance condition, we construct smooth functionssuch thatH = H0+Vhas eigenvalues. Given any countable set of points {Ej} in any spectral band of Ho obeying the same non-resonance condition, and any functionh(x) > 0 going to infinity arbitrarily slowly, we construct smooth functionssuch thatH = H0+Vhas eigenvalues {Ej}. On the other hand, we show that there is no eigenvalue ofH = H0+Vembedded in the spectral bands ifasxgoes to infinity. We prove also an analogous result for Jacobi operators.
DOI: 10.1016/j.jfa.2018.11.010
发表时间: 2019
影响因子: 1.7
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