Effect of a fermion on quantum phase transitions in bosonic systems

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

References in corpus (2)

• Excited state quantum phase transitions in many-body systems
• Finite-size scaling exponents in the interacting boson model

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