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O: Fachverband Oberflächenphysik

O 45: Poster Spins on Surfaces at the Atomic Scale

O 45.4: Poster

Dienstag, 18. März 2025, 18:00–20:00, P2

Coherent driving of interacting spins in single molecules — •Maria Steiner and Andrea Donarini — Institute for Theoretical Physics, University of Regensburg, Regensburg, Germany

The low energy spectrum of neutral closed shell molecules generically exhibits a set of singlet and triplet excited levels. The latter arises due to the exchange interaction between the unpaired electrons in singly occupied frontier orbitals. Moreover, the spatial anisotropy of these molecular states, combined with the spin-dipolar interaction, induces a zero-field splitting of the triplet. In recent AFM-ESR experiments on pentacene [1] Rabi oscillations between two of the split triplet states have been demonstrated. We now extend this concept to the full triplet space. By means of multiple frequency coherent driving, we investigate theoretically the rich dynamics of this molecular qutrit in search, for example, of the analogue of the dark states observed for Λ-systems in atomic physics.
[1] Sellies et al., Nature 624, 64-68 (2023).

Keywords: ESR; single molecules; zero-field splitting; scanning probe microscopy