ARPES and Spin-ARPES measurements within NFFA Trieste facility allowed to establish that the mineral kitkaite (NiTeSe) originating from the Kitka river area in Finland, hosts type II Dirac Fermions and spin polarized topological surface states with implementation potential in novel photonics, spintronics, and optoelectronics devices.

Combined STM/S and ARPES and Spin-ARPES measurements within NFFA Trieste allowed to correlate the two distinct electronic band structures measured on Pt3Te4 to two distinct surface terminations, both characterized by strongly spin-polarized states. This renders mitrofanovite a candidate material for tunable device functionalities in nanoelectronics, spintronics, optoelectronics, and plasmonic applications.