Strange metal crossover in the doped holographic superconductor*

In this talk, we study the "normal" phase of a holographic superconductor. The specific model used was originally introduced by Kiritsis and Li (JHEP01(2016)147) to incorporate the different orders phases similar to the ones observed in High Temperature Superconductors. These phases include the normal phase, the SC phase, the antiferromagnetic phase and a striped phase as a function of both, temperature and doping. Within this model we study the fermionic spectral functions in the normal phase at zero and finite temperatures. Using analytic and numerical methods, we found a crossover in the normal phase from a strange metal with short lived excitations at small doping, into a Fermi liquid with well defined quasiparticles at large doping. The critical doping at which excitations becomes long lived increases with temperature. The emerging phase diagram is qualitatively similar to that of High Temperature Superconductors.

The results of this work have been published in JHEP10(2018)068