Journal
PHYSICAL REVIEW B
Volume 89, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.184419
Keywords
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Funding
- Hungarian Research Funds [OTKA K108918, TAMOP-4.2.2.B-10/1-2010-0009, TAMOP-4.2.1/B-09/1/KMR-2010-0002, TAMOP 4.2.4. A/2-11-1-2012-0001]
- Estonian Ministry of Education and Research [SF0690029s09, IUT23-03]
- Estonian Science Foundation [ETF8170, ETF8703]
- bilateral program of the Estonian and Hungarian Academies of Sciences [SNK-64/2013]
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program), Japan
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We derive a sumrule to demonstrate that the static magnetoelectric (ME) effect is governed by optical transitions that are simultaneously excited by the electric and magnetic components of light. The ME sum rule is applicable to a broad class of materials lacking the spatial inversion and the time-reversal symmetries, including multiferroic compounds. Due to the dynamical ME effect, the optical excitations in these materials can exhibit directional dichroism, i.e., the absorption coefficient can be different for counter-propagating light beams. According to the ME sum rule, the magnitude of the linear ME effect of a material is mainly determined by the directional dichroism of its low-energy optical excitations. An application of the sum rule to the multiferroic Ba2CoGe2O7, Sr2CoSi2O7, and Ca2CoSi2O7 shows that in these compounds the static ME effect is mostly governed by the directional dichroism of the spin-wave excitations in the giga-terahertz spectral range. On this basis, we argue that the studies of directional dichroism and the application of the ME sum rule promote the synthesis of new materials with large static ME effect.
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