Fig. 7: Phase diagrams of oligomer chains with long-range interactions. | Communications Physics

Fig. 7: Phase diagrams of oligomer chains with long-range interactions.

From: Exceptional points in oligomer chains

Fig. 7

a–d \({{{{{{{\mathcal{PT}}}}}}}}\) symmetry phase diagrams of oligomer chains of size \({{{{{{{\mathcal{N}}}}}}}}=\{4,5,6,7\}\), given by the evolution of the exceptional point \({(g/\kappa )}_{{{{{{{{\mathcal{N}}}}}}}}}\), as a function of the first and second-neighbor couplings g and h, both in units of κ. White: unbroken phase. Colors: broken phase. The analytic results in the h → 0 limit are marked on the vertical axis [Eq. (29)]. The \({{{{{{{\mathcal{N}}}}}}}}=3\) case was already presented in Fig. 4b.

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