Fig. 1: Identification of the non-Fermi liquid.
From: Identification of non-Fermi liquid fermionic self-energy from quantum Monte Carlo data
a Schematic phase diagram of an FM (2 + 1)D QCP, adapted from ref. 51. b Fermionic self-energy at an FM (2 + 1)D QCP, calculated by QMC simulation, adapted from ref. 51. Here, we focus on the point on the Fermi surface with Fermi wavevector along the x-direction. The QMC self-energy appears to have a leading term of the form 1/ωn. c Quantum part of fermionic self-energy at an FM (2 + 1)D QCP. The black dashed line shows the theoretical prediction of the zero-temperature Fermi self-energy, while the red dashed line marks the low-frequency asymptotic form. We emphasize that the theory is parameter free, and all system parameters, for example, Fermi velocities, are determined separately from the model or QMC measurement.
