2013/08/31 by Emanuela Margapoti, E. Margapoti, Philipp Strobel +17 · 1 citation
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Advanced Memory and Neural Computing #Azobenzene #Chemistry #Graphene #Graphene research and applications #Materials science #Molecule #Nanotechnology #Photochromic and Fluorescence Chemistry #Photochromism #Physics #Quantum mechanics #cond-mat.mtrl-sci
paper · pdf · doi:10.1021/nl503681z
published as Nano letters 14 (12), 6823-6827, 2014
openalex publication_date 2014/11/21 · arxiv created 2014/12/01 · arxiv updated 2015/03/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The perfect transmission of charge carriers through potential barriers in graphene (Klein tunneling) is a direct consequence of the Dirac equation that governs the low-energy carrier dynamics. As a result, localized states do not exist in unpatterned graphene, but quasibound states can occur for potentials with closed integrable dynamics. Here, we report the observation of resonance states in photoswitchable self-assembled molecular(SAM)-graphene hybrid. Conductive AFM measurements performed at room temperature reveal strong current resonances, the strength of which can be reversibly gated on- and off- by optically switching the molecular conformation of the mSAM. Comparisons of the voltage separation between current resonances (∼ 70-120 mV) with solutions of the Dirac equation indicate that the radius of the gating potential is ∼ 7 ± 2 nm with a strength ≥ 0.5 eV. Our results and methods might provide a route toward optically programmable carrier dynamics and transport in graphene nanomaterials.