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arXiv · 0711.4594

P-wave Pairing in Two-Component Fermi Systems with Unequal Population near Feshbach Resonance

R. Liao·F. Popescu·K. Quader
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Abstract

We explore p-wave pairing in a single-channel two-component Fermi system with unequal population near Feshbach resonance. Our analytical and numerical study reveal a rich superfluid (SF) ground state structure as a function of imbalance. In addition to the state $\Delta_{\pm 1} \propto Y_{1\pm 1}$, a multitude of ``mixed'' SF states formed of linear combinations of $Y_{1m}$'s give global energy minimum under a phase stability condition; these states exhibit variation in energy with the relative phase between the constituent gap amplitudes. States with local energy minimum are also obtained. We provide a geometric representation of the states. A $T$=0 polarization vs. p-wave coupling phase diagram is constructed across the BEC-BCS regimes. With increased polarization, the global minimum SF state may undergo a quantum phase transition to the local minimum SF state.

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R. Liao, F. Popescu, K. Quader. 2007-11-28. P-wave Pairing in Two-Component Fermi Systems with Unequal Population near Feshbach Resonance. https://doi.org/10.1103/physrevb.88.134507

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