Spontaneous symmetry breakings in Z2 gauge theories for doped quantum dimer and eight-vertex models |
| |
Authors: | Ikuo Ichinose Daisuke Yoshioka |
| |
Institution: | Department of Applied Physics, Nagoya Institute of Technology, Nagoya 466-8555, Japan |
| |
Abstract: | Behavior of doped fermions in Z2 gauge theories for the quantum dimer and eight-vertex models is studied. Fermions carry charge and spin degrees of freedom. In the confinement phase of the Z2 gauge theories, these internal symmetries are spontaneously broken and a superconducting or Neél state appears. On the other hand in the deconfinement-topologically ordered state, all symmetries are respected. From the view point of the quantum dimer and eight-vertex models, this result indicates interplay of the phase structure of the doped fermions and background configuration of the dimer or the eight-vertex groundstate. At the quantum phase transitions in these systems, structure of the doped fermions groundstate and also that of the background dimer or eight-vertex groundstate both change. Translational symmetry breaking induces a superconducting or antiferromagnetic state of the doped fermions. |
| |
Keywords: | 11 15 -q 71 10 Hf |
本文献已被 ScienceDirect 等数据库收录! |
|