Surface state at evidenced by angle-resolved photoemission spectroscopy and ab initio calculations
arXiv:2101.03399
Abstract
Perovskite alkaline earth stannates, such as and , showing light transparency and high electrical conductivity (when doped), have become promising candidates for novel optoelectrical devices. Such devices are mostly based on hetero-structures and understanding of their electronic structure, which usually deviates from the bulk, is mandatory for exploring a full application potential. Employing angle-resolved photoemission spectroscopy and ab initio calculations we reveal the existence of a 2-dimensional metallic state at the -terminated surface of a 1\% La-doped thin film. The observed surface state is characterized by distinct carrier density and a smaller effective mass in comparison with the corresponding bulk values. The small surface effective mass of about can cause an improvement of the electrical conductivity of BSO based heterostructures.