Electric field control of natural optical activity in a multiferroic helimagnet

Controlling the chiral degree of freedom in matter has long been an important issue for many fields of science. The spin-spiral order, which exhibits a strong magnetoelectric coupling, gives rise to chirality irrespective of the atomic arrangement of matter. Here, we report the resonantly enhanced natural optical activity on the electrically active magnetic excitation, that is, electromagnon, in multiferroic cupric oxide. The electric field control of the natural optical activity is demonstrated through magnetically induced chirality endowed with magnetoelectric coupling. These optical properties inherent to multiferroics may lead to optical devices based on the control of chirality.

Automated summary

The resonantly enhanced natural optical activity on the electrically active magnetic excitation in multiferroic cupric oxide demonstrates electric field control through magnetically induced chirality endowed with magnetoelectric coupling. These inherent optical properties of multiferroics may lead to optical devices based on the control of chirality.