4.5 Article

Thermally induced band hybridization in bilayer-bilayer MoS2/WS2 heterostructure*

Journal

CHINESE PHYSICS B
Volume 30, Issue 5, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/abeee3

Keywords

two-dimensional materials; transition metal dichalcogenides (TMDs) heterostructure; band hybridization; interlayer exciton

Funding

  1. National Key Research and Development Program of China [2020YFA0309604]
  2. National Natural Science Foundation of China [11834017, 61888102, 12074413]
  3. Strategic Priority Research Program of Chinese Academy of Sciences [XDB30000000, XDB33000000]
  4. Key-Area Research and Development Program of Guangdong Province, China [2020B0101340001]
  5. Research Program of Beijing Academy of Quantum Information Sciences [Y18G11]

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By studying the bilayer MoS2/WS2 heterostructure, it was found that thermal annealing can increase interlayer coupling, resulting in the heterostructure behaving more like a new material after band hybridization. Experimental and theoretical studies also investigated the electric controllable direct and indirect infrared interlayer excitons in such system.
Transition metal dichalcogenides (TMDs), being valley selectively, are an ideal system hosting excitons. Stacking TMDs together to form heterostructure offers an exciting platform to engineer new optical and electronic properties in solid-state systems. However, due to the limited accuracy and repetitiveness of sample preparation, the effects of interlayer coupling on the electronic and excitonic properties have not been systematically investigated. In this report, we study the photoluminescence spectra of bilayer-bilayer MoS2/WS2 heterostructure with a type II band alignment. We demonstrate that thermal annealing can increase interlayer coupling in the van der Waals heterostructures, and after thermally induced band hybridization such heterostructure behaves more like an artificial new solid, rather than just the combination of two individual TMD components. We also carry out experimental and theoretical studies of the electric controllable direct and indirect infrared interlayer excitons in such system. Our study reveals the impact of interlayer coupling on interlayer excitons and will shed light on the understanding and engineering of layer-controlled spin-valley configuration in twisted van der Waals heterostructures.

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