English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We measure the coherent nonlinear response of excitons in a single-layer ofmolybdenum disulphide embedded in hexagonal boron nitride, forming a$h$-BN/MoS$_2$/$h$-BN heterostructure. Using four-wave mixing microscopy andimaging, we correlate the exciton homogeneous and inhomogeneous broadenings. Wefind that the exciton dynamics is governed by microscopic disorder on top ofthe ideal crystal properties. Analyzing the exciton ultra-fast density dynamicsusing amplitude and phase of the response, we investigate the relaxationpathways of the resonantly driven exciton population. The surface protectionvia encapsulation provides stable monolayer samples with low disorder, avoidingsurface contaminations and the resulting exciton broadening and modificationsof the dynamics. We identify areas localized to a few microns where the opticalresponse is totally dominated by homogeneous broadening. Across the sample oftens of micrometers, weak inhomogeneous broadening and strain effects areobserved, attributed to the remaining interaction with the $h$-BN andimperfections in the encapsulation process.

Coherence and density dynamics of excitons in a single-layer MoS$_2$ reaching the homogeneous limit