Speaker
Description
Two-dimensional van der Waals heterostructures have revealed unconventional phenomena at atomically precise interfaces, and further advances are expected in mixed-dimensional systems. Here we discuss exciton physics in free-standing 1D–2D heterostructures of carbon nanotubes and tungsten diselenide [1,2]. Chirality and layer number are identified to study band alignment effects, and the heterostructures are assembled using anthracene-assisted transfer [3]. For small-gap nanotubes with type I alignment, exciton transfer is observed [1]. For large-gap tubes forming type II alignment, we find that localized interface excitons exhibit quantum emission at room temperature [2]. With mixed-dimensional van der Waals heterostructures where band alignment can be engineered, new opportunities for quantum photonics are envisioned.
Work supported in part by JSPS, JST, and MEXT.
[1] N. Fang et al., Nature Commun. 14, 8152 (2023).
[2] N. Fang et al., Nature Commun. 15, 2871 (2024).
[3] K. Otsuka et al., Nature Commun. 12, 3138 (2021).
