Designable excitonic effects in van der Waals artificial crystals with exponentially growing thickness.

ABSTRACT: When disassembled into monolayers from their bulk crystals, two-dimensional (2D) transition metal dichalcogenides (TMDCs) exhibit exotic optical properties dominated by strong excitonic effects. Reassembling 2D TMDC layers to build bulk excitonic crystals can significantly boost their optical performance and introduce emerging functionalities toward optoelectronic and valleytronic applications. However, maintaining or manipulating 2D excitonic properties in bulk structures or superlattices is challenging. Herein, we developed a method to precisely construct m∙2^N-layer artificial excitonic crystals with only a number N of stacking operations (m denotes the layer number of the initial material unit), referred to as the "2^N method". We successfully fabricated a millimeter-scale we

SUBMITTER: Sun Q 

PROVIDER: S-EPMC11923259 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature