Local inhomogeneities resolved by scanning probe techniques and their impact on local 2DEG formation in oxide heterostructures.

ABSTRACT: Lateral inhomogeneities in the formation of two-dimensional electron gases (2DEG) directly influence their electronic properties. Understanding their origin is an important factor for fundamental interpretations, as well as high quality devices. Here, we studied the local formation of the buried 2DEG at LaAlO₃/SrTiO₃ (LAO/STO) interfaces grown on STO (100) single crystals with partial TiO₂ termination, utilizing in situ conductive atomic force microscopy (c-AFM) and scattering-type scanning near-field optical microscopy (s-SNOM). Using substrates with different degrees of chemical surface termination, we can link the resulting interface chemistry to an inhomogeneous 2DEG formation. In conductivity maps recorded by c-AFM, a significant lack of conduct

SUBMITTER: Rose MA 

PROVIDER: S-EPMC9419657 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature