Spontaneous Spin Polarization due to Tensor Selfenergies in Quark Matter in NJL Model

Abstract

We study the magnetic properties of quark matter in the NJL model including the tensor interaction. There are two kinds of spin-polarized phases: one appears in the chiral-broken phase, and the other in the chiral-restored phase where the quark mass is zero. The latter phase can appear independently of the strength of the tensor interaction.