Some sufficient conditions for existence of hyperinvariant subspaces for operators intertwined with unitaries

For a power bounded or polynomially bounded operator $T$ sufficient conditions for the existence of a nontrivial hyperinvariant subspace are given. The obtained hyperinvariant subspaces of $T$ have the form of the closure of the range of $\phi (T)$. Here $\phi$ is a singular inner function, if $T$ is polynomially bounded, or $\phi$ is an analytic in the unit disc function with absolutely summable Taylor coefficients and singular inner part, if $T$ is supposed to be power bounded only. Also, an example of a quasianalytic contraction $T$ is given. The quasianalytic spectral set of $T$ is not the whole unit circle $\mathbb{T}$, while $\sigma (T)=\mathbb{T}$. Proofs are based on results by Esterle, Kellay, Borichev and Volberg.