Fig. 2: EP singularity and anti-PT-symmetry breaking. | Nature Communications

Fig. 2: EP singularity and anti-PT-symmetry breaking.

From: Observation of anti-parity-time-symmetry, phase transitions and exceptional points in an optical fibre

Fig. 2

Measured (dots) and theoretical (solid lines) ℜe (left) and ℑm (right) parts of the eigenvalues of the system. The means of the two eigenvalues have been subtracted. Each point is an average of four measurements and the error bars denote one standard deviation. The phase transition and square- root-like dispersion around the EP are evident. Insets show results over a larger, more coarse scanning range Δv, to highlight the transition towards linear dependence away from the EP.

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