membranes*

Perovskite SrTiO₃ (STO) exhibits a wide range of exciting phenomena in addition to being a common substrate in epitaxial growth of various oxides like LaAlO₃, BaTiO₃, etc. There is a growing interest in studying new physical phenomena happens in the oxide materials in the two dimensional limit. We developed an etching method to fabricate free-standing STO membranes. The membranes are typically 5-8 um wide and 10-20 um long with thickness ranging from two to several tens of nanometers. We use Micro-Raman spectroscopy to investigate the STO membranes’ vibrational spectra and compare with that of the bulk STO. To exploit the high dielectric constant of STO, we design and fabricate electronic devices combining STO membranes with other two dimensional materials such as graphene and h-BN.