The absolutely continuous spectrum of the almost Mathieu operator
The absolutely continuous spectrum of the almost Mathieu operator
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发表时间:
2008-10
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通讯作者:
A. Avila
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作者:
A. Avila
We prove that the spectrum of the almost Mathieu operator is absolutely continuous if and only if the coupling is subcritical. This settles Problem 6 of Barry Simon's list of Schr\"odinger operator problems for the twenty-first century.