In Situ Electric-Field Control of THz Nonreciprocal Directional Dichroism in the Multiferroic Ba2CoGe2O7
| Autor: | István Kézsmárki, Sándor Bordács, L. Peedu, Y. Tokura, Urmas Nagel, Jakub Vit, Judit Romhányi, Vilmos Kocsis, J. Viirok, Karlo Penc, Yasujiro Taguchi, Yusuke Tokunaga, Péter Balla, Toomas Rõõm |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 127 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Nonreciprocal directional dichroism, also called the optical-diode effect, is an appealing functional property inherent to the large class of noncentrosymmetric 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 ${\mathrm{Ba}}_{2}{\mathrm{CoGe}}_{2}{\mathrm{O}}_{7}$ possessing opposite magnetoelectric susceptibilities. Combining THz spectroscopy and multiboson spin-wave analysis, we show that unbalancing the population of antiferromagnetic domains generates the nonreciprocal light absorption of spin excitations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|