One can consider two main types of metal-insulator transitions (MIT), nl. interaction-driven (Mott) or disorder-driven (Anderson-Mott). Recently, I have been reading that these MIT might also have quantum phase transition features (e.g. see https://arxiv.org/pdf/cond-mat/0309604.pdf p.30). However, the explanation remains rather vague in this reference.
Could someone provide me with a better explanation on how the metal-insulator transitions might be a quantum phase transitions, e.g. what are the arguments to suspect this? Good references (beside Sachdev's book) are also welcome! Thank you in advance.