Using the Husimi quasiprobability distribution, we investigate the phase space signatures of
excited-state quantum phase transitions (ESQPTs) in the Lipkin-Meshkov-Glick and coupled …

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 …

We present an extension of the Hamiltonian of the two dimensional limit of the vibron model
to encompass all possible interactions up to four-body operators. We apply this Hamiltonian …

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) …

We present a phase-space study of first-, second-and third-order quantum phase transitions
in the Lipkin–Meshkov–Glick model by means of the Husimi function. By analyzing the …

In most cases, excited-state quantum phase transitions can be associated with the existence
of critical points (local extrema or saddle points) in a system's classical limit energy …

It is shown that there is a linear relation between the relative Rényi entropy and the density
functional fidelity susceptibility. The derivative of the relative Rényi entropy with respect to …

Fluctuations of Hamiltonian eigenfunctions, measured by the inverse participation ratio
(IPR), turn out to characterize topological-band insulator transitions occurring in 2D Dirac …

We propose a new method to identify transitions from a topological insulator to a band
insulator in silicene (the silicon equivalent of graphene) in the presence of perpendicular …

We analyze the structure of low energy Hamiltonian eigenstates in zincblende
heterostructures (like HgTe/CdTe quantum wells) near the gamma point, under magnetic …