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I09-Surface and Interface Structural Analysis	Structure and growth of hexagonal boron nitride on Ir(111) Ferdinand Farwick Zum Hagen , Domenik M. Zimmermann , Caio C. Silva , Christoph Schlueter , Nicolae Atodiresei , Wouter Jolie , Antonio J. Martínez-Galera , Daniela Dombrowski , Ulrike A. Schröder , Moritz Will , Predrag Lazić , Vasile Caciuc , Stefan Blügel , Tien-Lin Lee , Thomas Michely , Carsten Busse Acs Nano DOI: 10.1021/acsnano.6b05819 Diamond Proposal Number(s): [9012, 10320, 12447] Show Abstract ▼ Abstract: Using the X-ray standing wave method, scanning tunneling microscopy, low energy electron diffraction, and density functional theory, we precisely determine the lateral and vertical structure of hexagonal boron nitride on Ir(111). The moiré superstructure leads to a periodic arrangement of strongly chemisorbed valleys in an otherwise rather flat, weakly physisorbed plane. The best commensurate approximation of the moiré unit cell is (12 × 12) boron nitride cells resting on (11 × 11) substrate cells, which is at variance with several earlier studies. We uncover the existence of two fundamentally different mechanisms of layer formation for hexagonal boron nitride, namely, nucleation and growth as opposed to network formation without nucleation. The different pathways are linked to different distributions of rotational domains, and the latter enables selection of a single orientation only.	Nov 2016

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