Fate of the Higgs mode near quantum criticality
  We study the relativistic O(N) field theory near the quantum critical point in 2+1 dimensions for N=2 and N=3. The scalar susceptibility is evaluated by Monte Carlo simulation. We show that the spectrum contains a peak associated with the Higgs mode, which remains well-defined all the way to the critical point. The fidelity of this peak and the amplitude ratio between the critical energy scales on both sides of the transition are computed. 
Snir Gazit, Daniel Podolsky, and Assa Auerbach
cond-mat.quant-gas cond-mat.str-el cond-mat.supr-con