Author

Wei-Yan Qi

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Preprint Oct 2026

Electronic structure of a persistent excitonic fluid far beyond the Mott limit

Excitons are conventionally expected to destabilize at high photoexcitation densities, as screening weakens the electron-hole attraction. Recent studies, however, challenge this paradigm, suggesting that excitons generated by strong optical pumping can remain stable even beyond the onset of population inversion. Here,...

Wei-Yan Qi, S. Ponzoni, Ashim Pramanik et al. · 0 citations

Preprint Nov 2026

Hydrogen-induced modification of the local charge density in MnSb$_2$Te$_4$

We investigate the effects of ionic hydrogen (H$^+$) intake on the occupied and unoccupied states of MnSb$_2$Te$_4$, a van der Waals magnetic material. Using angle-resolved photoemission spectroscopy (ARPES) and time-resolved ARPES, combined with resonant and core level photoemission, we reveal that hydrogen binds near...

Kyriaki Samioti, Wei-Yan Qi, S. Ponzoni et al. · 0 citations