We study electrical transport at quantum critical points (QCPs) associated with loop current ordering in a metal, focusing specifically on models of the “Hertz-Millis” type. At infrared (IR) fixed point and absence disorder, simplest such have infinite DC conductivity zero incoherent nonzero frequencies. However, we find that particular deformation, involving N <mml:math xmlns:mml="http://www.w...

The parametrically pumped Kerr model describes a driven-dissipative nonlinear cavity, whose nonequilibrium phase diagram features both continuous and discontinuous quantum transitions. We consider the consequences of these critical phenomena for fluctuations photocurrent obtained via weak measurements on cavity. Considering direct photodetection homodyne detection schemes, we find that current ...

Abstract We have studied 1/ f noise in critical current $$I_c$$ I c h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts $$\simeq 5$$ <...