Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.057403
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Funding
- KAKENHI, MEXT of Japan
- Funding Program for World-Leading Innovation R&D on Science and Technology (FIRST)
- Hungarian Research Funds [OTKA PD75615, NK72916, Bolyai 00256/08/11, TAMOP-4.2.1/B-09/1/KMR-2010-0002]
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We propose that concurrently magnetic and ferroelectric, i.e., multiferroic, compounds endowed with electrically active magnetic excitations (electromagnons) provide a key to producing large directional dichroism for long wavelengths of light. By exploiting the control of ferroelectric polarization and magnetization in a multiferroic oxide Ba2CoGe2O7, we demonstrate the realization of such a directional light-switch function at terahertz frequencies in resonance with the electromagnon absorption. Our results imply that this hidden potential is present in a broad variety of multiferroics.
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