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/

Global: Zendy Plus annual

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

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report circularly-polarized optical reflection spectroscopy of monolayerWS$_2$ and MoS$_2$ at low temperatures (4~K) and in high magnetic fields to65~T. Both the A and the B exciton transitions exhibit a clear and very similarZeeman splitting of approximately $-$230~$\mu$eV/T ($g\simeq -4$), providingthe first measurements of the valley Zeeman effect and associated $g$-factorsin monolayer transition-metal disulphides. These results complement and arecompared with recent low-field photoluminescence measurements of valleydegeneracy breaking in the monolayer diselenides MoSe$_2$ and WSe$_2$. Further,the very large magnetic fields used in our studies allows us to observe thesmall quadratic diamagnetic shifts of the A and B excitons in monolayer WS$_2$(0.32 and 0.11~$\mu$eV/T$^2$, respectively), from which we calculate excitonradii of 1.53~nm and 1.16~nm. When analyzed within a model of non-localdielectric screening in monolayer semiconductors, these diamagnetic shifts alsoconstrain and provide estimates of the exciton binding energies (410~meV and470~meV for the A and B excitons, respectively), further highlighting theutility of high magnetic fields for understanding new 2D materials.

Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS$_2$ and MoS$_2$ to 65 Tesla