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arXiv 0811.3745math-phmath.MPmath.SP
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绝热拟周期Schr dinger算子的奇异谱

On the singular spectrum for adiabatic quasi-periodic Schrödinger Operators

M. Marx, H. Najar

摘要:

本文研究了实直线上一类拟周期薛定谔算子族在绝热极限下的谱性质。我们假设绝热等能曲线有一个沿动量方向延伸的实分支。在这种情况发生的能量区间,我们得到的李雅普诺夫指数的渐近公式,并表明,频谱是纯粹的奇异。Fedotov和Klopp在\cite{FEKL1}的一个特例中证明了这一结果。

英文摘要:

In this paper we study spectral properties of a family of quasi-periodic Schrödinger operators on the real line in the adiabatic limit. We assume that the adiabatic iso-energetic curve has a real branch that is extended along the momentum direction. In the energy intervals where this happens, we obtain an asymptotic formula for the Lyapunov exponent and show that the spectrum is purely singular. This result was conjectured and proved in a particular case by Fedotov and Klopp in \cite{FEKL1}.

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