HOLOTUBE: Fingerprints of quantum criticality in locally resolved transport

Specialist level
Andrew Lucas
University of Colorado Boulder



New experimental methods such as nitrogen vacancy center magnetometry allow for the imaging of local transport phenomena well below the micrometer scale. I will describe how these methods might be used to experimentally reveal quantum critical dynamics which is invisible in conventional bulk transport measurements. Using the AdS4-Einstein-Maxwell system as a toy model, I will describe what happens as current is pushed through a geometric constriction in both hydrodynamic and quantum critical transport regimes, both in charge neutral and non-zero density limits. Remarkably, our model does appear to quantitatively capture locally imaged transport in charge neutral graphene at high temperatures, albeit in a largely ohmic transport regime.