Fig. 1: Phase diagram.
From: Self-normal and biorthogonal dynamical quantum phase transitions in non-Hermitian quantum walks
Phase diagram of a non-unitary QW in Eq. (12). Topological phases are distinguished by the winding number ν as a function of the coin parameters θ1 and θ2. The black lines denote the topological phase boundaries, separating the parameter space into three distinct phases (yellow, magenta and green). The blue dashed lines represent the boundaries between PT-symmetry-unbroken and PT-symmetry-broken regions. When Im[Ek] ≠0, it indicates that the PT-symmetry-broken regions are located between the blue dashed lines near the topological phase boundaries. ①denotes the coin parameters of the initial Floquet operators \({\hat{U}}^{i}\). ②-⑤ indicate the coin parameters of different final Floquet operators \({\hat{U}}^{f}\)
