Spectrum of multidimensional periodic operators
Spectrum of multidimensional periodic operators
复制标题
多维周期算子的谱
DOI:
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发表时间:
1990
期刊:
影响因子:
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通讯作者:
O. Veliev
中科院分区:
文献类型:
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作者:
O. Veliev
Let Ω be a lattice in the n-dimensional Euclidean space Rn and let F be the fundamental domain of the lattice Ω. We denote by H the Schrödinger operator generated in L2(Rn) by the expression −‡u + q(x)u(1), and by Ht the operator generated in L2(F) by the expression (1) and by quasiperiodic boundary conditions, where q(x) is a periodic (with respect to the lattice Ω) function. Asymptotic formulas for the eigenvalues of the operator Ht are obtained and with the aid of these formulas it is proved that there exists a number λ(q) such that the interval [λ(q), ∞] belongs to the spectrum of the operator H [for n≥3 in the case of sufficiently smooth potentials q(x), while for n=2 for any potential q(x) from L2(F)], i.e., the Bethe-Sommerfeld conjecture is proved for arbitrary lattices.