Lattice reconstruction in MoSe\(_2\)-WSe\(_2\) heterobilayers synthesized by chemical vapor deposition

Vertical van der Waals heterostructures of semiconducting transition metal dichalcogenides realize moiré systems with rich correlated electron phases and moiré exciton phenomena. For material combinations with small lattice mismatch and twist angles as in MoSe\(_2\)-WSe\(_2\), however, lattice recon...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2023-05
Main Authors: Li, Zhijie, Tabataba-Vakili, Farsane, Zhao, Shen, Rupp, Anna, Bilgin, Ismail, Herdegen, Ziria, März, Benjamin, Watanabe, Kenji, Taniguchi, Takashi, Schleder, Gabriel R, Baimuratov, Anvar S, Kaxiras, Efthimios, Müller-Caspary, Knut, Högele, Alexander
Format: Article
Language:English
Subjects:
Arrays
Chemical synthesis
Chemical vapor deposition
Excitons
Heterostructures
Moire patterns
Reconstruction
Transition metal compounds
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Vertical van der Waals heterostructures of semiconducting transition metal dichalcogenides realize moiré systems with rich correlated electron phases and moiré exciton phenomena. For material combinations with small lattice mismatch and twist angles as in MoSe\(_2\)-WSe\(_2\), however, lattice reconstruction eliminates the canonical moiré pattern and instead gives rise to arrays of periodically reconstructed nanoscale domains and mesoscopically extended areas of one atomic registry. Here, we elucidate the role of atomic reconstruction in MoSe\(_2\)-WSe\(_2\) heterostructures synthesized by chemical vapor deposition. With complementary imaging down to the atomic scale, simulations, and optical spectroscopy methods we identify the coexistence of moiré-type cores and extended moiré-free regions in heterostacks with parallel and antiparallel alignment. Our work highlights the potential of chemical vapor deposition for applications requiring laterally extended heterosystems of one atomic registry or exciton-confining heterostack arrays.
ISSN:2331-8422
DOI:10.48550/arxiv.2212.07686