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

Abstract

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

arXiv commentversion accepted

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Cited by in corpus (4)

• Imaging antiferromagnetic domains in LiCoPO${}_4$ via the optical magnetoelectric effect
• Selection rules and dynamic magnetoelectric effect of the spin waves in multiferroic BiFeO${}_3$
• Optical magnetoelectric effect in the polar honeycomb antiferromagnet Fe2Mo3O8
• Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface