The purpose of this article is to study the influence of dynamical behavior of classical Hamilton systems with ergodic and periodic properties on asymptotic behavior of eigenfunctions and eigenvalues of the corresponding positive elliptic operator on a compact Riemannian manifold, and conversely, to investigate the asymptotic properties of eigenfunctions or eigenvalues which make the corresponding classical mechanics ergodic or periodic. We will give an estimate of the off-diagonal asymptotics of quantum observables for quantum ergodic systems and a regularity result on limit measures associated with quantum observables for systems with homogeneous Lebesgue spectrum. We will also give necessary and sufficient conditions for ergodicity and weak-mixing property of the classical Hamilton systems, which are obtained by a reduction procedure with symmetry, in terms of semi-classical asymptotic properties of eigenfunctions. Finally, a result on the structure of the set of cluster points for the differences of eigenvalues in a certain semi-classical sense is given, which is considered as a semi-classical analogy of Helton’s theorem.
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