Degeneracy beyond the parity-symmetry protection in the Lipkin-Meshkov-Glick model

Jamil Khalouf-Rivera, Miguel Carvajal, Francisco Pérez-Bernal

Degeneracy patterns in quantum mechanics stem from the system symmetries. In particular, the broken-symmetry phase in the well-known Lipkin-Meshkov-Glick (LMG) model is composed of…