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Non-reciprocal directional dichroism, also called the optical-diode effect,is an appealing functional property inherent to the large class ofnon-centrosymmetric magnets. However, the in-situ electric control of thisphenomenon is challenging as it requires a set of conditions to be fulfilled:Special symmetries of the magnetic ground state, spin-excitations withcomparable magnetic- and electric-dipole activity and switchable electricpolarization. We demonstrate the isothermal electric switch between domains ofBa$_2$CoGe$_2$O$_7$ possessing opposite magnetoelectric susceptibilities.Combining THz spectroscopy and multiboson spin-wave analysis, we show thatunbalancing the population of antiferromagnetic domains generates thenon-reciprocal light absorption of spin excitations.

In-situ electric field control of THz non-reciprocal directional dichroism in the multiferroic Ba$_2$CoGe$_2$O$_7$