Two-loop disorder effects on the nematic quantum criticality in -wave superconductors
arXiv:1505.06533 · doi:10.1016/j.physleta.2015.05.028
Abstract
The gapless nodal fermions exhibit non-Fermi liquid behaviors at the nematic quantum critical point that is supposed to exist in some -wave cuprate superconductors. This non-Fermi liquid state may be turned into a disorder-dominated diffusive metal if the fermions also couple to a disordered potential that generates a relevant perturbation in the sense of renormalization group theory. It is therefore necessary to examine whether a specific disorder is relevant or not. We study the interplay between critical nematic fluctuation and random chemical potential by performing renormalization group analysis. The parameter that characterizes the strength of random chemical potential is marginal at the one-loop level, but becomes marginally relevant after including the two-loop corrections. Thus even weak random chemical potential leads to diffusive motion of nodal fermions and the significantly critical behaviors of physical implications, since the strength flows eventually to large values at low energies.
16 pages, 12 figures
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- Superconductivity in two-dimensional disordered Dirac semimetals
- Cooper instability generated by attractive fermion-fermion interaction in the two-dimensional semi-Dirac semimetals
- Quantum criticality of fermion velocities and critical temperature nearby a putative quantum phase transition in the -wave superconductors
- Critical behavior around the fixed points driven by fermion-fermion interactions and disorders in the nodal-line superconductors