The main aim of the present paper by means of the quantum Markov chain (QMC) approach is to establish the existence of a phase transition for the quantum Ising model with competing XY interaction. In this scheme, the C*-algebraic approach is employed to the phase transition problem. Note that these kinds of models do not have one-dimensional analogs, i.e., the considered model persists only on trees. It turns out that if the Ising part interactions vanish, then the model with only competing XY-interactions on the Cayley tree of order two does not have a phase transition. By phase transition, we mean the existence of two distinct QMCs that are not quasi-equivalent and their supports do not overlap. Moreover, it is also shown that the QMC associated with the model has a clustering property, which implies that the von Neumann algebras corresponding to the states are factors.
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Recall that a representation π1 of a C*-algebra is normal with respect to another representation π2, if there is a normal *-epimorphism such that ρ◦π2 = π1. Two representations π1 and π2 are called quasi-equivalent if π1 is normal with respect to π2, and conversely, π2 is normal with respect to π1. This means that there is an isomorphism such that α◦π1 = π2. Two states φ and ψ of are said to be quasi-equivalent if the GNS representations πφ and πψ are quasi-equivalent.51