Low-temperature orientationally ordered structures of two-dimensional C60.
Orientationally ordered structures of two-dimensional (2D) C(60) at low temperature have been investigated theoretically and experimentally. Using total energy optimization with a phenomenological potential, we find the ground state is a close packed hexagonal lattice in which all the molecules have the same orientation. Several local minima of the potential energy surface are found to be associated with other 1 x 1 lattices as well as 2 x 2 lattices. The energies of the orientational domain boundaries of the 1x1 lattices are also computed, and two kinds of which yield negative values. A majority of these theoretical findings are confirmed by our low-temperature scanning tunneling microscopy study of a 2D C(60) array supported on a self-assembled monolayer.
Yuan
Lan-Feng
LF
Open Laboratory of Bond Selective Chemistry and Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China.
Yang
Jinlong
J
Wang
Haiqian
H
Zeng
Changgan
C
Li
Qunxiang
Q
Wang
Bing
B
Hou
J G
JG
Zhu
Qingshi
Q
Chen
D M
DM