51 research outputs found
g-Factors and the Interplay of Collective and Single-Particle Degrees of Freedom in Superdeformed Mass-190 Nuclei
Interplay of collective and single-particle degrees of freedom is a common
phenomenon in strongly correlated many-body systems. Despite many successful
efforts in the study of superdeformed nuclei, there is still unexplored physics
that can be best understood only through the nuclear magnetic properties. We
point out that study of the gyromagnetic factor (g-factor) may open a unique
opportunity for understanding superdeformed structure. Our calculations suggest
that investigation of the g-factor dependence on spin and particle number can
provide important information on single-particle structure and its interplay
with collective motion in the superdeformed mass-190 nuclei. Modern
experimental techniques combined with the new generation of sensitive detectors
should be capable of testing our predictions.Comment: 4 pages, 2 eps figures, accepted by Phys. Rev.
SU(4) Model of High-Temperature Superconductivity: Manifestation of Dynamical Symmetry in Cuprates
The mechanism that leads to high-temperature superconductivity in cuprates
remains an open question despite intense study for nearly two decades. Here, we
introduce an SU(4) model for cuprate systems having many similarities to
dynamical symmetries known to play an important role in nuclear structure
physics and in elementary particle physics. Analytical solutions in three
dynamical symmetry limits of this model are found: an SO(4) limit associated
with antiferromagnetic order; an SU(2) limit that may be interpreted as a
d-wave pairing condensate; and an SO(5) limit that may be interpreted as a
doorway state between the antiferromagnetic order and the superconducting
order. It is demonstrated that with a slightly broken SO(5) but under
constraint of the parent SU(4) symmetry, the model is capable of describing the
rich physics that is crucial in explaining why cuprate systems that are
antiferromagnetic Mott insulators at half filling become superconductors
through hole doping.Comment: 16 pages, 4 figures, proceedings of "Nuclei and Mesoscopic Physics"
to be published by AI
- …