title: First-principles study of length dependence of conductance in alkanedithiols.
abstract: Electronic transport properties of alkanedithiols are calculated by a first-principles method based on density functional theory and nonequilibrium Green's function formalism. At small bias, the I-V characteristics are linear and the resistances conform to the Magoga's exponential law. The calculated length-dependent decay constant gamma which reflects the effect of internal molecular structure is in accordance with most experiments quantitatively. Also, the calculated effective contact resistance R(0) is in good agreement with the results of repeatedly measuring molecule-electrode junctions [B. Xu and N. Tao, Science 301, 1221 (2003)].
authors.affiliation: Department of Physics, Fudan University, Shanghai 200433, People's Republic of China.
authors.forename: Y X
authors.initials: YX
authors.lastname: Zhou
authors.forename: F
authors.initials: F
authors.lastname: Jiang
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: R
authors.initials: R
authors.lastname: Note
authors.forename: H
authors.initials: H
authors.lastname: Mizuseki
authors.forename: Y
authors.initials: Y
authors.lastname: Kawazoe