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Cadmium arsenide (Cd3As2) has recently attracted considerable interest for the presence of 3D massless Dirac fermions with ultrahigh mobility and magnetoresistance. However, its surface properties are currently largely unexplored both theoretically and experimentally, due to the very large unit cell and the challenging growth of single‐crystal samples, respectively. Here, by combining ab initio calculations with surface‐science spectroscopic experiments, the presence of a surface reconstruction is unveiled in centimeter‐scale (112)‐oriented Cd3As2 single‐crystal foils produced by the self‐selecting vapor growth. Outermost Cd atoms descend into the As‐sublayer with a subsequent self‐passivation of the dangling bonds with As atoms, forming the triangle lattice previously imaged by scanning tunneling microscopy. Moreover, the oxidation mechanism of this reconstructed surface, dominated by the formation of …
Publication date: 
1 Jun 2019

Junfeng Gao, Anna Cupolillo, Silvia Nappini, Federica Bondino, Raju Edla, Vito Fabio, Raman Sankar, Yong‐Wei Zhang, Gennaro Chiarello, Antonio Politano

Biblio References: 
Volume: 29 Issue: 26 Pages: 1900965
Advanced Functional Materials