Gyrotropic birefringence via electromagnon resonance in a multiferroic of spin origin
We investigate the gyrotropic birefringence (GB) that is a light-propagation-direction-dependent nonreciprocal response of birefringence, arising from the dynamical magnetoelectric coupling in a multiferroic manganite with spin-cycloid order in terms of time-domain terahertz polarimetry. The GB show...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-06-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.023345 |
| Summary: | We investigate the gyrotropic birefringence (GB) that is a light-propagation-direction-dependent nonreciprocal response of birefringence, arising from the dynamical magnetoelectric coupling in a multiferroic manganite with spin-cycloid order in terms of time-domain terahertz polarimetry. The GB shows up as the enhanced nonreciprocal optical rotation on electromagnon resonance. The magnitude of the GB is found to scale with the bilinear coupling of ferroic order parameters P·M (P: electric polarization, M: magnetization) through the magnetic-field dependence with spin-flop transition. Quantitative spectral analysis reveals that the intermode coupling of electromagnon and antiferromagneic resonance plays an essential role for the enhancement of the GB. |
|---|---|
| ISSN: | 2643-1564 |