Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 56: Multiferroics and Magnetoelectric coupling II (joint session MA/KFM)
MA 56.8: Talk
Friday, April 5, 2019, 11:15–11:30, H39
Electric field control of the nonreciprocal light absorption in Ba2CoGe2O7 — •Jakub Vít1, Toomas Rõõm2, Urmas Nagel2, Johan Viirok2, Vilmos Kocsis1,3, Yoshinori Tokura3, István Kézsmárki1,4, and Sándor Bordács1 — 1Budapest University of Technology and Economics, Hungary — 2National Institute Of Chemical Physics And Biophysics, Estonia — 3RIKEN CEMS, Japan — 4Experimental Physics 5, University of Augsburg, Germany
In crystalline solids where space inversion and time-reversal symmetries are simultaneously broken, the propagation of (quasi)particles can be different when the wave vector is reversed. Strong nonreciprocal light absorption has been observed on spin-wave excitations of multiferroics, i.e. ferroelectric and magnetic materials, where the sign and the magnitude of the effect were controlled by an external magnetic field. Here, we report an electric-field control of the nonreciprocal light absorption on THz excitations of Ba2CoGe2O7. In the canted antiferromagnetic phase, we demonstrate that an electric field can be used to switch between low- and high-absorption states of magnetoelectric excitations. Our finding can facilitate the use of multiferroics in low-power consumption switchable optical diodes.