Effect of a fermion on quantum phase transitions in bosonic systems
arXiv:1111.0781 · doi:10.1016/j.physletb.2011.10.024
Abstract
The effect of a fermion with angular momentum j on quantum phase transitions of a (s,d) bosonic system is investigated. It is shown that the presence of a fermion strongly modifies the critical value at which the transition occurs, and its nature, even for small and moderate values of the coupling constant. The analogy with a bosonic system in an external field is mentioned. Experimental evidence for precursors of quantum phase transitions in bosonic systems plus a fermion (odd-even nuclei) is presented.
4 pages, 3 figures