BCS-BEC quantum phase transition and collective excitations in two-dimensional Fermi gases with p- and d-wave pairings

Gaoqing Cao, Lianyi He, Pengfei Zhuang

It is generally believed that the BCS-BEC evolution in fermionic systems with s-wave pairing is a smooth crossover. However, for nonzero orbital-angular-momentum pairing such as p-…