Journal
NANOPHOTONICS
Volume 7, Issue 4, Pages 753-762Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2017-0114
Keywords
optical activity; chiral structures; TMDs; van der Waals structure
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Funding
- Government of the Russian Federation (at the Ioffe Institute of RAS) [14.W03.31.0011]
- RF [SP-2912.2016.5]
- Basis Foundation
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We show that the stacks of two-dimensional semiconductor crystals with the chiral packing exhibit optical activity and circular dichroism. We develop a microscopic theory of these phenomena in the spectral range of exciton transitions that takes into account the spin-dependent hopping of excitons between the layers in the stack and the interlayer coupling of excitons via electromagnetic field. For the stacks of realistic two-dimensional semiconductors such as transition metal dichalcogenides, we calculate the rotation and ellipticity angles of radiation transmitted through such structures. The angles are resonantly enhanced at the frequencies of both bright and dark exciton modes in the stack. We also study the photoluminescence of chiral stacks and show that it is circularly polarized.
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