Picturing quantum phase transitions

Publication date: Available online 26 October 2018Source: Physics Letters AAuthor(s): C. Muñoz, M. Gaeta, R. Gomez, A.B. KlimovAbstractWe discuss the quantum phase transitions (QPT) in N-spin chains from the point of view of collective observables. We show that the measurement space representation is a convenient tool for the analysis of phase transitions, allowing the determination of an appropriate set of macroscopic order parameters (for a given Hamiltonian). Quantum correlations in the vicinity of the critical points are analyzed both in the ground states and low temperature thermal states.

Source: Physics Letters A - October 27, 2018 Category: Physics Source Type: research