Bound states and the Szegő condition for Jacobi matrices and Schrödinger operators
Bound states and the Szegő condition for Jacobi matrices and Schrödinger operators
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雅可比矩阵和薛定谔算子的束缚态和 Szegő 条件
DOI:
10.1016/s0022-1236(03)00070-3
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发表时间:
2002
影响因子:
1.7
通讯作者:
B. Simon
中科院分区:
文献类型:
--
作者:
D. Damanik;D. Hundertmark;B. Simon
For Jacobi matrices with an=1+(−1)nαn−γ, bn=(−1)nβn−γ, we study bound states and the Szegő condition. We provide a new proof of Nevai's result that if γ> 1 2 , the Szegő condition holds, which works also if one replaces (−1)nby cos (μn) . We show that if α=0, β≠0, and γ< 1 2 , the Szegő condition fails. We also show that if γ=1, α and β are small enough (β2+8α2< 1 24 will do), then the Jacobi matrix has finitely many bound states (for α=0, β large, it has infinitely many).