Holder regularity of integrated density of states for the Almost Mathieu operator in a perturbative regime

被引:44
作者
Bourgain, J [1 ]
机构
[1] Inst Adv Studies, Princeton, NJ 08540 USA
基金
美国国家科学基金会;
关键词
almost Mathieu operator; integrated density of states; Green's function;
D O I
10.1023/A:1007641323456
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Consider the Almost Mathieu operator H-lambda = lambda cos 2 pi(k omega +theta)+Delta on the lattice. It is shown that for large lambda, the integrated density of states is Holder continuous of exponent kappa < 1/2. This result gives a precise version in the perturbative regime of recent work by M. Goldstein and W. Schlag on Holder regularity of the integrated density of states for 1D quasi-periodic lattice Schrodinger operators, assuming positivity of the Lyapunov exponent (and proven by different means). Our approach provides also a new way to control Green's functions, in the spirit of the author's work in KAM theory. It is by no means restricted to the cosine-potential and extends to band operators.
引用
收藏
页码:83 / 118
页数:36
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