Observation of floating surface state in obstructed atomic insulator
candidate NiP$_2$
Observation of floating surface state in obstructed atomic insulator
candidate NiP$_2$
Obstructed atomic insulator is recently proposed as an unconventional material, in which electric charge centers localized at sites away from the atoms. A half-filling surface state would emerge at specific interfaces cutting through these charge centers and avoid intersecting any atoms. In this article, we utilized angle-resolved photoemission spectroscopy and …