Akai-Kasaya M, Shimizu K, Watanabe Y, Saito A, Aono M, Kuwahara Y
Department of Precision Science & Technology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Phys Rev Lett. 2003 Dec 19;91(25):255501. doi: 10.1103/PhysRevLett.91.255501. Epub 2003 Dec 17.
A molecular wire candidate, the polydiacetylene chain, fabricated in a substantial support layer of monomers self-assembled on a highly ordered pyrolytic graphite surface, was studied using scanning tunneling microscopy and spectroscopy. The density of states of individual polymers and constituent monomers were observed on the same surface, and then compared with the calculated results. The spectrum delineating the density of states of the polydiacetylene wire clearly reveals the theoretically predicted pi-band and band edge singularities of the one-dimensional polymer.
