Band dispersion of quasi-single crystal thin film phase pentacene monolayer studied by angle-resolved photoelectron spectroscopy

Ohtomo, Manabu; Suzuki, Tadamasa; Shimada, Toshihiro; Hasegawa, Tetsuya
September 2009
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p123308
Academic Journal
Intermolecular band dispersion of thin film phase pentacene grown epitaxially on step-bunched [formula] Bi–Si(111) was investigated using angle resolved photoemission spectroscopy at 130 K. We evaluated the transfer integrals using two-dimensional tight-binding fit to the experimental dispersion and found that adjacent molecules in Γ-M direction have the strongest coupling as predicted. The estimated effective mass at the top of the valence band was isotropic and ranged between 0.8 and 1.0 of the electron mass.


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