Quantum fermionic spin glasses
a clear gap
1996 FERMIONIC QUANTUM SPIN GLASS TRANSITIONS Opperman-Rosenow
1996 Landau theory of quantum spin glasses
1983 Ma-Fradkin Localization and interactions in a disordered electron gas
We have shown in this paper that a systematic expansion around a weakly disordered metallic phase can be
done by means of the 1/N expansion