Figure 3
From: Dynamical Quantum Phase Transition and Quasi Particle Excitation

Bogoliubov–de Gennes quasiparticle spectrum \(\pm {\varepsilon }_{k}^{1,2}\) for the extended quantum compass model at (a) the isotropic point (IP) Jo = Je = 1, and (b) at the anisotropic point Jo ≠ Je (Jo = 1, Je = 1.2).