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SO(5) superconductors in a Zeeman magnetic field

Jiang-Ping Hu, Shou-Cheng Zhang

DOI 10.1103/PhysRevB.62.R791 · Physical Review B

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Abstract

The generic symmetry of a system under a uniform Zeeman magnetic field is U(1)×U(1). However, we show that SO(5) models in the presence of a finite chemical potential and a finite Zeeman magnetic field can have an exact SU(2)×U(1) symmetry. This principle can be used to test SO(5) symmetry at any doping level.

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