We study phase space properties of critical, parity symmetric, N-qudit systems undergoing a
quantum phase transition (QPT) in the thermodynamic N→∞ limit. The D= 3 level (qutrit) …

Collective spin operators for symmetric multi-quDit (namely identical D-level atom) systems
generate a U (D) symmetry. We explore generalizations to arbitrary D of SU (2)-spin …

In this paper we pursue the use of information measures (in particular, information diagrams)
for the study of entanglement in symmetric multi-quDit systems. We use generalizations to U …

We introduce the notion of mixed symmetry quantum phase transition (MSQPT) as
singularities in the transformation of the lowest-energy state properties of a system of …

We propose coherent ('Schrödinger cat-like') states adapted to the parity symmetry providing
a remarkable variational description of the ground and first excited states of vibron models …

Characterizing and quantifying quantum correlations in states of many-particle systems is at
the core of a full understanding of phase transitions in matter. In this work, we continue our …

A classification of SU (2)-invariant projected entangled paired states (PEPS) on the square
lattice, based on a unique site tensor, has been recently introduced by Mambrini et al.[M …

Spontaneous symmetry breaking in quantum phase transitions leads to a system having
degenerate ground states in its broken-symmetry phase. In order to detect all possible …

In this article we provide a review of geometrical methods employed in the analysis of
quantum phase transitions and non-equilibrium dissipative phase transitions. After a …

We systematically investigate the excited-state quantum phase transition (ESQPT) in the
anisotropic quantum Rabi model, which interpolates between the quantum Rabi model with …