Fig. 1: Structure and optical transitions in NbOI2.
From: Coupling of electronic transition to ferroelectric order in a 2D semiconductor
a, b Crystal structure of NbOI2 viewed perpendicular to bc-plane (a) and along b-axis (b). c. Scanning tunneling microscopy image of cleaved NbOI2 single crystal at room temperature (RT). The inset shows the FT of the topography. d Differential reflectance spectra of 7-layers NbOI2 on z-cut quartz with incident light polarized along either crystallographic c- or b-axis at RT. ΔR is defined as Rsample – Rsubstrate in steady state and R in the dominator is Rsubstrate.
