Raman spectroscopy of free-standing perovskite oxide membranes

Raman spectroscopy is commonly used to distinguish features in ultrathin layered materials such as graphene and transition metal dichalcogenides. Free-standing perovskite oxide membranes are now commonly synthesized, adding a whole new class of 2D materials. In this talk, we present our group theory guided first principles results on simulated Raman spectra of free-standing perovskite membranes of SrTiO₃ (STO) and BaSnO₃ (BSO). We show that the Raman spectra of these films have distinct features that originate from their different symmetries and electronic structure, and put forward a method to identify and study free-standing perovskite oxide membranes using Raman spectroscopy.