Fig. 2 | Nature Communications

Fig. 2

From: Observation of an anti-PT-symmetric exceptional point and energy-difference conserving dynamics in electrical circuit resonators

Fig. 2

APT-symmetric model circuit and its spectral property. a Circuit diagram of APT-symmetric LRC resonators. The circuit consists of two resistively coupled amplifying LRC resonators with negative resistor units. A variable inductor is used for L2 to precisely control the energy-detuning parameter ε. b ε-dependent resonance-excitation spectrum W1(f)

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