title: Exact SO(5) symmetry in the spin-3/2 fermionic system.
abstract: The spin-3/2 fermion models with contact interactions have a generic SO5 symmetry without any fine-tuning of parameters. Its physical consequences are discussed in both the continuum and lattice models. A Monte Carlo algorithm free of the sign problem at any doping and lattice topology is designed when the singlet and quintet interactions satisfy U0< or = U2< or = -3/5 U0 (U0< or = 0), thus making it possible to study different competing orders with high numerical accuracy. This model can be accurately realized in ultracold atomic systems.
authors: Department of Physics, McCullough Building, Stanford University, Stanford, CA 94305-4045, USA.
authors: Congjun
authors: C
authors: Wu
authors: Jiang-ping
authors: JP
authors: Hu
authors: Shou-cheng
authors: SC
authors: Zhang