Hey, I am trying to understand electron transport in 2D semiconductors. One question keeps lingering in my mind is whether the Einstein relation holds for these 2D materials. The only literature I can find is back to 1997 (http://arxiv.org/ftp/arxiv/papers/1004/1004.1717.pdf). The author proposed one situation that Einstein Relation may not hold: electron transport in fluid particles. Any thought about this is appreciated!