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arXiv · 2101.03399

Surface state at $BaSnO_3$ evidenced by angle-resolved photoemission spectroscopy and ab initio calculations

Muntaser Naamneh·Abhinav Prakash·Eduardo B. Guedes·W. H. Brito·Ming Shi·Nicholas C. Plumb·Bharat Jalan·Milan Radović
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Abstract

Perovskite alkaline earth stannates, such as $BaSnO_3$ and $SrSnO_3$, 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 $SnO_2$-terminated surface of a 1\% La-doped $BaSnO_3$ 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 $0.12m_e$ can cause an improvement of the electrical conductivity of BSO based heterostructures.

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Muntaser Naamneh, Abhinav Prakash, Eduardo B. Guedes, W. H. Brito, Ming Shi, Nicholas C. Plumb, Bharat Jalan, Milan Radović. 2021-01-09. Surface state at $BaSnO_3$ evidenced by angle-resolved photoemission spectroscopy and ab initio calculations. https://arxiv.org/abs/2101.03399

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