Topology of two-dimensional C60 domains

J. G. Hou (), Yang Jinlong, Wang Haiqian, Li Qunxiang, Zeng Changgan, Yuan Lanfeng, Wang Bing, D. M. Chen and Zhu Qingshi
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J. G. Hou: Structure Research Laboratory, University of Science and Technology of China
Yang Jinlong: Structure Research Laboratory, University of Science and Technology of China
Wang Haiqian: Structure Research Laboratory, University of Science and Technology of China
Li Qunxiang: Open Laboratory of Bond Selective Chemistry, University of Science and Technology of China
Zeng Changgan: Structure Research Laboratory, University of Science and Technology of China
Yuan Lanfeng: Open Laboratory of Bond Selective Chemistry, University of Science and Technology of China
Wang Bing: Structure Research Laboratory, University of Science and Technology of China
D. M. Chen: Structure Research Laboratory, University of Science and Technology of China
Zhu Qingshi: Open Laboratory of Bond Selective Chemistry, University of Science and Technology of China

Nature, 2001, vol. 409, issue 6818, 304-305

Abstract: Abstract Two-dimensional systems possess a unique topological ordering that is not found in either three- or one-dimensional systems1. Using high-resolution scanning tunnelling microscopy, we show here that a 60-carbon-atom (C60) array on a self-assembled monolayer of an alkylthiol forms an ideal two-dimensional system which has another novel topological order originating from the orientational degrees of freedom. At a temperature of 5 K, the two-dimensional C60 forms a domain structure in which the correlation function of the molecular orientation within a domain is constant anywhere (so every C60 has the same orientation) but changes abruptly at domain boundaries. Remarkably, the positional order and the bond-orientational order are both fully preserved across domain boundaries.

Date: 2001
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DOI: 10.1038/35053163

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