Quadrupolar excitons in MoSe<sub>2</sub> bilayers.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39910056.
- Also identified by DOI 10.1038/s41467-025-56586-3 and PMC identifier 11799382.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The quest for platforms to generate and control exotic excitonic states has greatly benefited from the advent of transition metal dichalcogenide (TMD) monolayers and their heterostructures. Among the unconventional excitonic states, quadrupolar excitons-a superposition of two dipolar excitons with anti-aligned dipole moments-are of great interest for applications in quantum simulations and for the investigation of many-body physics. Here, we unambiguously demonstrate the emergence of quadrupolar excitons in natural MoSe<sub>2</sub> homobilayers, whose energy shifts quadratically in electric field. In contrast to trilayer systems, MoSe<sub>2</sub> homobilayers have many advantages, which include a larger coupling between dipolar excitons. Our experimental observations are complemented by many-particle theory calculations offering microscopic insights in the formation of quadrupolar excitons. Our results suggest TMD homobilayers as ideal platform for the engineering of excitonic states and their interaction with light and thus candidate for carrying out on-chip quantum simulations.