p-WAVE PAIRING IN FERMI SYSTEMS WITH UNEQUAL POPULATION NEAR FESHBACH RESONANCE

摘要

We explore p-wave pairing in a single-channel two-component Fermi system with unequalpopulation near Feshbach resonance. Our analytical and numerical study reveal a richsuperfluid (SF) ground state structure as a function of imbalance. In addition to the stateΔ±1 ∝Y_(1±1) , a multitude of "mixed" SF states formed linear combinations of Yjm'sgive global energy minimum under a phase stability condition; these states exhibit vari-ation in energy with the relative phase between the constituent gap amplitudes. Stateswith local energy minimum are also obtained. We provide a geometric representation ofthe states. A T = 0 polarization vs. p-wave coupling phase diagram is constructed acrossthe BEC-BCS regimes. With increased polarization, the global minimum SF state mayundergo a quantum phase transition to the local minimum SF state.