Higgs mode in a superfluid of Dirac fermions
Higgs mode in a superfluid of Dirac fermions
We study the Higgs amplitude mode in the $s$-wave superfluid state on the honeycomb lattice inspired by recent cold atom experiments. We consider the attractive Hubbard model and focus on the vicinity of a quantum phase transition between semimetal and superfluid phases. On either side of the transition, we find …