Fig. 3: Optical absorption properties of NiI2. | npj Quantum Materials

Fig. 3: Optical absorption properties of NiI2.

From: Magnetoelectric effect in van der Waals magnets

Fig. 3: Optical absorption properties of NiI2.The alternative text for this image may have been generated using AI.

a Optical absorption of NiI2 with magnetic exciton at Ehv = 1.384 eV and two-magnon side-band peak at Ehv = 1.396 eV below TN2. b Derivative optical absorption shows a clear correlation between multiferroicity and the magnetic exciton. (Fig. 3a, b is reproduced from Fig. 2a, c in Ref. 14).

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