Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 16: Multiferroics and Magnetoelectric coupling II (joint session MA/KFM)

KFM 16.8: Vortrag

Freitag, 5. April 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 Kocsis^1,3, Yoshinori Tokura³, István Kézsmárki^1,4, 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.