Fermi isospectrality for discrete periodic Schrödinger operators
Fermi isospectrality for discrete periodic Schrödinger operators
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离散周期薛定谔算子的费米同谱
DOI:
10.1002/cpa.22161
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发表时间:
2023
影响因子:
3
通讯作者:
Liu, Wencai
中科院分区:
文献类型:
--
作者:
Liu, Wencai
Let Γ=q1Z⊕q2Z⊕…⊕qdZ$\Gamma =q_1\mathbb {Z}\oplus q_2 \mathbb {Z}\oplus \ldots \oplus q_d\mathbb {Z}$, where ql∈Z+$q_l\in \mathbb {Z}_+$, l=1,2,…,d$l=1,2,\ldots ,d$, are pairwise coprime. Let Δ+V$\Delta +V$ be the discrete Schrödinger operator, where Δ is the discrete Laplacian on Zd$\mathbb {Z}^d$ and the potential V:Zd→C$V:\mathbb {Z}^d\rightarrow \mathbb {C}$ is Γ‐periodic. We prove three rigidity theorems for discrete periodic Schrödinger operators in any dimension d≥3$d\ge 3$:(1)If at some energy level, Fermi varieties of two real‐valued Γ‐periodic potentialsVandYare the same (this feature is referred to asFermi isospectralityofVandY), andYis a separable function, thenVis separable;(2)If two complex‐valued Γ‐periodic potentialsVandYare Fermi isospectral and both V=⨁j=1rVj$V=\bigoplus _{j=1}^rV_j$ and Y=⨁j=1rYj$Y=\bigoplus _{j=1}^r Y_j$ are separable functions, then, up to a constant, lower dimensional decompositions Vj$V_j$ and Yj$Y_j$ are Floquet isospectral, j=1,2,…,r$j=1,2,\ldots ,r$;(3)If a real‐valued Γ‐potentialVand the zero potential are Fermi isospectral, thenVis zero.In particular, all conclusions in (1), (2) and (3) hold if we replace the assumption “Fermi isospectrality” with a stronger assumption “Floquet isospectrality”.
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DOI:
10.1090/s0002-9947-1989-0961624-6
发表时间:
1989
影响因子:
1.3
作者:
T. Kappeler
通讯作者:
T. Kappeler
DOI:
10.3929/ethz-a-000579584
发表时间:
1988
期刊:
arXiv: Mathematical Physics
影响因子:
--
作者:
D. Bättig
通讯作者:
D. Bättig
影响因子:
1.3
作者:
Liu, Wencai
通讯作者:
Liu, Wencai
影响因子:
1.3
作者:
Kuchment, Peter
通讯作者:
Kuchment, Peter
影响因子:
1.1
作者:
T. Kappeler
通讯作者:
T. Kappeler