Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 29: Poster Session - Solid-liquid Interfaces: Structure, Spectroscopy
O 29.1: Poster
Monday, March 16, 2020, 18:15–20:00, P1A
Enantioselective interactions of L- and D-alpha polyalanine molecules investigated by STM and STS — •Shuyuan Xue1, Nguyen Thi Ngoc Ha1, and Christoph Tegenkamp1,2 — 1TU Chemnitz, Germany — 2Leibniz Universität Hannover, Germany
The chiral induced spin selectivity (CISS) effect has been intensively investigated towards applications in molecular spintronics and spinselective processes in biology. The adsorption of a chiral molecules with a specific handedness affects the direction of the spin-polarization as well as magnetization of a surface [1]. For L alpha-helical polyalanine (PA) films on HOPG and Au(111) we found recently densely packed selfassembled monolayers. Thereby, interdigitation in between adjacent molecules favors also rotational order [2]. In this study we co-adsorbed L- and D-alpha polyalanine molecules from the liquid phase on HOPG and investigated the structure by scanning tunneling microscopy under ambient conditions. In contrast to L-alpha polyalanine molecules, the enantiometric mixture revealed a (2 x 1) structure. Apparently, the interdigitation takes place only along one crystallographic direction with one kind of molecules leading to phase separation of the enantiomers. [1] R. Naaman et al., Chimia 72, 394 (2018). [2] T.N.H. Nguyen et al. J. Phys. Chem. C 123, 612 (2019)