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Fingerprints of quantum criticality in locally resolved transport

December 17, 2021 - 11:00am
Speaker: 
Andy Lucas
Institution: 
University of Colorado Boulder

Abstract: New experimental methods such as nitrogen vacancy center magnetometry allow for the imaging of local transport phenomena well below the micron length 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 a holographic 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 seem to quantitatively capture locally imaged transport in charge neutral graphene at high temperatures, albeit in a largely ohmic transport regime with only weak “quantum critical” corrections.

Location: ATL 4402