From my understanding, they're claiming that the linear resistance-temperature curve with a slope of h-bar is evidence that the electrons are in something akin to a maximally entangled state.
Via the AdS-CFT correspondence, such a maximally entangled state is mapped to a black hole in AdS space in +1 dimensions.
edit: do you think Legros et al. agree with that interpretation, or is the Quanta magazine -> Atlantic -> nextbigfuture article just using the Legros paper as an excuse to bring up the "holographic duality" views of Hartnoll and Sachdev?
From my understanding, they're claiming that the linear resistance-temperature curve with a slope of h-bar is evidence that the electrons are in something akin to a maximally entangled state.
Via the AdS-CFT correspondence, such a maximally entangled state is mapped to a black hole in AdS space in +1 dimensions.