2004/08/01 by Tadaaki Nagao, Jerzy T. Sadowski, M. Saito +7 · 1 citation
Physics and Astronomy · #Surface and Thin Film Phenomena #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena
paper · doi:10.1103/physrevlett.93.105501
openalex publication_date 2004/08/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Our scanning tunneling microscopy and electron diffraction experiments revealed that a new two-dimensional allotrope of Bi forms on the Si(111)-7x7 surface. This pseudocubic [012]-oriented allotrope is stable up to four atomic layers at room temperature. Above this critical thickness, the entire volume of the film starts to transform into a bulk single-crystal (001) phase, as the bulk contribution in the cohesion becomes dominant. Based on ab initio calculations, we propose that the new allotrope consists of black phosphorus-like puckered layers stabilized by saturating all the p(z) dangling bonds in the film.