Classification of Non-Fermi Liquids and Universal Superconducting Fluctuations

Abstract:

Quantum critical metals host a wide variety of non-Fermi liquid states, whose properties depend on the nature of critical fluctuations 
coupled to the Fermi surface. While some of non-Fermi liquids remain stable down to zero temperature, others exhibit strong superconducting instabilities. A systematic classification of non-Fermi liquids, however, has been challenging, largely due to the absence of conventional scale invariance associated with the presence of a finite Fermi momentum.