Abstract

Moire' superlattices based on two-dimensional transition metal dichalcogenides (TMDs) have emerged as a highly versatile and fruitful platform for exploring correlated topological electronic phases. One of the most remarkable examples is the recently discovered fractional quantum anomalous Hall effect (FQAHE) under zero magnetic field. Here we propose a minimal structure that hosts long-lived excitons—a ubiquitous bosonic excitation in TMD semiconductors—with narrow topological bosonic bands. The nontrivial exciton topology originates from hybridization of moir´ e interlayer excitons, and is tunable by controlling twist angle and electric field. At small twist angle, the lowest exciton bands are isolated from higher energy bands, and provides a solid-state realization of bosonic Kane-Mele model with topological flatbands, which could potentially support the bosonic version of FQAHE.

Publication Details
Publication Type
Journal Article
Year of Publication
2024
Volume
133
Issue
136403
DOI
10.1103/PhysRevLett.133.136403
URL
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.136403
Journal
Physical Review Letters
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Contributors
Date Published
09/2024