@article {riss_imaging_2014, title = {Imaging and Tuning Molecular Levels at the Surface of a Gated Graphene Device}, journal = {{ACS} Nano}, volume = {8}, number = {6}, year = {2014}, month = {06/2014}, pages = {5395{\textendash}5401}, abstract = {

Gate-controlled tuning of the charge carrier density in graphene devices provides new opportunities to control the behavior of molecular adsorbates. We have used scanning tunneling microscopy ({STM}) and spectroscopy ({STS}) to show how the vibronic electronic levels of 1,3,5-tris(2,2-dicyanovinyl)benzene molecules adsorbed onto a graphene/{BN}/{SiO}2 device can be tuned via application of a backgate voltage. The molecules are observed to electronically decouple from the graphene layer, giving rise to well-resolved vibronic states in {dI}/{dV} spectroscopy at the single-molecule level. Density functional theory ({DFT}) and many-body spectral function calculations show that these states arise from molecular orbitals coupled strongly to carbon?hydrogen rocking modes. Application of a back-gate voltage allows switching between different electronic states of the molecules for fixed sample bias.

}, issn = {1936-0851}, doi = {10.1021/nn501459v}, url = {http://dx.doi.org/10.1021/nn501459v}, author = {Riss, Alexander and Wickenburg, Sebastian and Tan, Liang Z. and Tsai, Hsin-Zon and Kim, Youngkyou and Lu, Jiong and Bradley, Aaron J. and Ugeda, Miguel M. and Meaker, Kacey L. and Watanabe, Kenji and Taniguchi, Takashi and Zettl, Alex and Fischer, Felix R. and Louie, Steven G. and Crommie, Michael F.} }