Nuclear quantum shape-phase transitions in odd-mass systems

Quantum Shape-Phase Transitions in Finite Nuclei

Quantum phase transitions are structural changes occurring at zero temperature as a function of a coupling constant and driven by quantum fluctuations. An example is the phase transition between different shapes of nuclei for which the equilibrium deformation plays the role of an order parameter. A proper description of such phase transitions necessitates the inclusion of correlation effects be...

Quantum Phase Transitions in Random Systems

Quantum Phase Transitions in Magnetic Systems

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Phase transitions in open quantum systems.

We consider the behavior of open quantum systems through the dependence of the coupling to one decay channel by introducing the coupling parameter alpha, which is proportional to the average degree of overlapping. Under critical conditions, a reorganization of the spectrum takes place that creates a bifurcation of the time scales with respect to the lifetimes of the resonance states. We derive ...

Quantum phase transitions in electronic systems

Quantum phase transitions occur at zero temperature when some non-thermal control-parameter like pressure or chemical composition is changed. They are driven by quantum rather than thermal fluctuations. In this review we first give a pedagogical introduction to quantum phase transitions and quantum critical behavior emphasizing similarities with and differences to classical thermal phase transi...