Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies V
O 52.7: Vortrag
Mittwoch, 20. März 2024, 16:45–17:00, MA 004
Spin excitations and correlations in nanographene-based multi-spin platforms — •Elia Turco1, Fupeng Wu2, Nils Krane1, Ji Ma2, Roman Fasel1, Xinliang Feng2, and Pascal Ruffieux1 — 1EMPA, Duebendorf, Switzerland — 2Faculty of Chemistry, Technical University of Dresden, Dresden, Germany
Chemical design offers the unique opportunity to realize robust molecular spin qubits with tailored magnetic properties, strong qubit interactions, and with practical bottom-up scalability. In this context, much attention has recently been given to open-shell nanographenes (NGs), whose spin interactions can be engineered with atomic precision by on-surface synthesis[1]. In particular, zigzag-edged triangular NGs (triangulenes) are regarded as prototypical magnetic building blocks, with a total spin S scaling with molecular size.
In this contribution, I will discuss multi-spin platforms fabricated via on-surface synthesis from the two smallest S = 1/2 and S = 1 triangulenes[2]. Scanning probe microscopy & spectroscopy of antiferromagnetically coupled hetero-dimers and trimers allow a thorough characterization of these coupled quantum spin systems, with their multiple inelastic spin excitations unambiguously reflecting the underlying spin Hamiltonians. The degenerate spin ground state in asymmetrically coupled spin systems, where each spin unit has a different Kondo exchange with the substrate, also allows to gain novel insights into Kondo correlations. [1] De Oteyza D.G. et al., J. Phys.: Condens. Matter 34 (2022); [2] Turco E. et al., JACS Au, 3, (2023)
Keywords: Carbon Magnetism; Scanning Tunneling Microscopy (STM); Kondo effect; Spin Qubits; Triangulene