Two-dimensional (2D) semiconductors, including MoS2, WS2, MoSe2, etc., have provided a fascinating opportunity to explore optical properties in 2 dimensions. In particular, van der Waals (vdW) heterostructures composed of these 2D semiconductors, such as WS2/MoS2, offer a novel platform for optical physics arising from interlayer excitons. It is, however, not straightforward to understand optical response from interlayer excitons because contributions from interlayer excitons with different transition energies overlap to a show broad peak in optical spectra. In this work, we have focused on the assignment of PL emission from interlayer excitons by using hBN-sandwiched high-quality samples.

© 2017 Japan Society of Applied Physics, Optical Society of America

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