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Quantum phase transitions across p-wave Feshbach resonance

V. Gurarie·L. Radzihovsky·A. V. Andreev
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Abstract

We study a single-species polarized Fermi gas tuned across a narrow p-wave Feshbach resonance. We show that in the course of a BEC-BCS crossover the system can undergo a magnetic field-tuned quantum phase transition from a p_x-wave to a p_x+i p_y-wave superfluid. The latter state, that spontaneously breaks time-reversal symmetry, furthermore undergoes a topological p_x+ i p_y to p_x+ i p_y transition at zero chemical potential μ. In two-dimensions, for μ>0 it is characterized by a Pfaffian ground state exhibiting topological order and non-Abelian excitations familiar from fractional quantum Hall systems.

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V. Gurarie, L. Radzihovsky, A. V. Andreev. 2005-07-01. Quantum phase transitions across p-wave Feshbach resonance. https://doi.org/10.1103/physrevlett.94.230403

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