Linear magnetoelectric electro-optical effect

Berry curvature and the magnetic moment of Bloch electrons in quantum materials yield unexpected electro-optical effects. Here, the authors derive a generalized constitutive relation for current response in electrically biased systems using semiclassical Boltzmann theory. They uncover a magnetoelectric electro-optical effect requiring broken time-reversal or inversion symmetry. This work reveals how Berry curvature and magnetic moment textures in Bloch bands can lead to unique electromagnetic signatures, potentially enabling new ways to manipulate light in quantum materials.