SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 45: Focus Session: Scanning Probe Microscopy with Quartz Sensors I

O 45.4: Talk

Wednesday, March 29, 2023, 11:30–11:45, CHE 89

A two dimensional array of radical molecules on Pb(111) — Jung-Ching Liu¹, Chao Li¹, H. Chen², Ping Zhou³, Xunshan Liu³, Ulrich Aschauer³, Silvio Decurtins³, Shi-Xia Liu³, Wulf Wulfhekel², Ernst Meyer¹, and •Rémy Pawlak¹ — ¹University of Basel, Basel, Switzerland — ²Karlsruhe Institute of Technology, Karlsruhe, Germany — ³University of Bern, Bern, Switzerland

The assembly of molecules to form a quantum dot array is of interest for quantum computing with the highest areal density. In this contribution, we show the supramolecular assembly of 4,5,9,10-tetrabromo-1,3,6,8-tetraazapyrene (TBTAP) molecules on superconducting Pb(111), self-organized in neighboring rows of radicals and neutral molecules [1]. By triggering a local field with a STM/AFM microscope at low temperature, we show that individual occupied molecules can be discharged efficiently, revealing Coulomb rings in spatial dI/dV maps. Charged molecules host spin 1/2, which is validated by dI/dV spectroscopy with μeV resolution through the observation of a pair of in-gap Yu-Shiba-Rusinov (YSR) states in the supra-conducting gap. The unpaired electron cloud extends spatially over the entire molecule and interacts with neighbouring electrons, resulting in the formation of YSR bands along the entire molecular domain. [1] J.C. Liu et al. submitted.