Optical activity in chiral stacks of 2D semiconductors

Nanophotonics

article

Alexander V. Poshakinskiy¹  Dmitrii R. Kazanov¹  Tatiana V. Shubina¹  Sergey A. Tarasenko¹ 

[1]Ioffe Institute

关键词: optical activity;    chiral structures;    TMDs;    van der Waals structure;   

DOI  :  10.1515/nanoph-2017-0114

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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.

【 授权许可】

CC BY