@article{10272/8008,
year = {2010},
url = {http://hdl.handle.net/10272/8008},
abstract = {We study the effect of the inclusion of the U(2) Lie algebra second-order Casimir operator in a model
Hamiltonian of the vibron model two-dimensional limit. We extend previously published results, showing that
the inclusion of the additional term does not alter the ground-state quantum phase transition between the
symmetric and deformed limits of the model. Nevertheless, the inclusion of this operator implies deep changes
on the excitation spectrum and on the ensuing excited-state quantum phase transitions.},
publisher = {American Physical Society},
title = {Anharmonicity effects in the bosonic U(2)-SO(3) excited-state quantum phase transition},
author = {Pérez Bernal, Francisco and Álvarez Bajo, Osiris},
}