The optical absorption in indirect semiconductor to semimetal PtSe2 arises from direct transitions

Marin Tharrault, Sabrine Ayari, Mehdi Arfaoui +12

$\mathrm{PtS}{\mathrm{e}}_2$ is a van der Waals material transitioning from an indirect bandgap semiconductor to a semimetal with increasing thickness. Its absorption threshold has been conjectur…