title: A Unified Theory Based on SO(5) Symmetry of Superconductivity and Antiferromagnetism
abstract: The complex phase diagram of high-critical temperature (Tc) superconductors can be deduced from an SO(5) symmetry principle that unifies antiferromagnetism and d-wave superconductivity. The approximate SO(5) symmetry has been derived from the microscopic Hamiltonian, and it becomes exact under renormalization group flow toward a bicritical point. This symmetry enables the construction of a SO(5) quantum nonlinear final sigma model that describes the phase diagram and the effective low-energy dynamics of the system. This model naturally explains the basic phenomenology of the high-Tc superconductors from the insulating to the underdoped and the optimally doped region.
authors.affiliation: Department of Physics, Stanford University, Stanford, CA 94305, USA.
authors.initials: SC
authors.lastname: Zhang