Fig. 2.

The low-frequency fermionic spectral weight $\mathcal{G}(\overrightarrow{k})$ (Eq. 2) at temperature $T=0.17$, shown for the noninteracting band structure ($\alpha =0$) and for $\alpha =1.5$ for several values of $h$. For $h=2.3$, a small $C_4$ symmetry-breaking field has been applied in the simulation. Data are for a $20\times 20$ system with various combinations of periodic and antiperiodic boundary conditions. Other parameters are $V=0.5$ and $\mu =1.0$.