Figure 1 | Scientific Reports

Figure 1

From: Su-Schrieffer-Heeger chain with one pair of \(\mathcal{P}\mathcal{T}\)-symmetric defects

Figure 1

Schematic illustration of the \(\mathcal{P}\mathcal{T}\)-symmetric SSH chain. The total chain number is even N = 2n. The balanced gain and loss are at site m and its \(\mathcal{P}\)-symmetric site N + 1 − m. (a) Even n, m = n, (b) odd n, m = n, (c) even n, (d) odd n. The red and blue lines represent the inhomogeneous couplings. The gain and loss sites are in green and red, respectively.

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