Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Organic Molecules on Inorganic Substrates VI: Chirality, Charge Transfer, Self-Assembly

O 83.7: Vortrag

Donnerstag, 4. April 2019, 16:45–17:00, H9

Structure and electronic properties of end states of self-assembled 1D covalent molecular chains on Au(111) — •Ales Cahlik¹, Jack Hellerstedt¹, Martin Svec¹, Vjai Meena Santhini¹, Simon Pascal², Pingo Mutombo¹, Karel Výborný¹, Olivier Siri², and Pavel Jelinek¹ — ¹Institute of Physics, ASCR, v.v.i., Cukrovarnická 10, CZ-16253 Praha 6, Czech Republic — ²Aix Marseille Université, CNRS, CINaM UMR 7325, 13288, Marseille, France

1D structures offer a rich ecosystem for realizing quantum states with potential application for advanced information technologies. Surface confined molecular self-assembly is one avenue for creating 1d systems, where the extant structure is controlled by the precursor shape, and functional group interlinking chemistry. Here we study self-assembled 1d chains of zwitterionic molecule bis-bidentate ditopic (DABQDI) on Au(111) in ultrahigh vacuum, measured at 5K using combined scanning tunneling and non-contact atomic force microscopies (STM/ nc-AFM). Submolecular resolution achieved with a CO- functionalized tip offers detailed structural information, specifically regarding the unusual hydrogen bonds linking the precursor units. In-gap electronic states near the Fermi energy are observed via scanning tunneling spectroscopy (STS), strongly localized to the chain ends. We present our latest efforts to understand and simulate the observed structures via density functional theory (DFT) and nc-AFM simulations, and rationalize the observed electronic properties via modelling inspired by the Su, Schrieffer, Heeger (SSH) one-dimensional tight binding model.