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O: Fachverband Oberflächenphysik

O 72: 2D Materials beyond graphene: Growth, structure and substrate interaction – Poster (joint session O/TT)

O 72.2: Poster

Mittwoch, 11. März 2026, 18:00–20:00, P2

Growth of 2D molecular networks on graphene — •Haruto Shibahara and Toyo Kazu Yamada — Dept. Materials Science, Chiba Univ., Chiba, Japan

We demonstrate the engineering of qubits on solid surfaces using organic molecules and transition-metal magnetic atoms. Atomically flat and clean graphene (Gr) grown on an Ir(111) substrate was selected as the platform. Scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) revealed the characteristic moiré pattern, while scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES) confirmed the presence of Dirac bands. Although single atoms can in principle serve as qubits, they tend to thermally diffuse on surfaces and their energy levels may remain degenerate. To overcome these issues, it is necessary to coordinate the atoms with organic ligands, whose ligand fields can lift the degeneracy. As a first approach, we attempted to employ 1,3,5-tris(4-bromophenyl)benzene (TBB) molecules to form a two-dimensional (2D) covalent organic framework. However, on the Gr surface we found that thermal activation desorbed the TBB molecules before they could undergo Ullmann coupling. As a second approach, we attempted to grow a 2D metal organic framework (MOF) on Gr. The details of this effort will be discussed.

Keywords: graphene; ARPES; STM