Determination of band curvatures by angle-resolved two-photon photoemission in thin films of C60 on Ag(111) |
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Authors: | Shipman Steven T Garrett-Roe Sean Szymanski Paul Yang Aram Strader Matthew L Harris Charles B |
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Institution: | Chemistry Department, University of California-Berkeley, 94720, USA. |
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Abstract: | The thickness-dependent interfacial band structure was determined for thin films of C(60) on Ag(111) by angle-resolved two-photon photoemission spectroscopy. Dispersions of molecular-orbital derived bands (HOMO, LUMO+1, and LUMO+2) were acquired, and limits were placed on their possible effective masses. A group theoretic approach is also incorporated to further understand the properties of these states. The HOMO, LUMO+1, and LUMO+2 bands possess (best-fit) effective masses of -7 m(e), -7 m(e), and -12 m(e), respectively. These values are consistent with theoretical calculations, averaged over the closely spaced subbands for each state, and provide practical limits on the effective fundamental charge-transport properties of C(60) films. |
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