Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 42: Other Transport Topics
TT 42.2: Talk
Wednesday, March 11, 2026, 09:45–10:00, HSZ/0105
Dynamical current as a spin-state discriminator in open-shell GNR’s — •Nico Leumer1, Geza Giedke2, and Thomas Frederiksen2 — 1Wrocław Tech — 2Donostia International Physics Center
The recent advances of surface synthesis unlocked the potential of open-shell physics in graphene nanoribbons (GNRs) which ever since have gained significant attention. Normally chemically unstable, these structures feature unpaired, localized pZ-electrons pinned at zero energy, giving rise to the unique phenomenon of π-magnetism. At half-filling certain GNRs host quasi degenerate spin singlets/triplets states with a vanishing energy gap for long ribbons and without significantly increasing the gap conventional current-based measurements hardly distinguish these spin textures.
In our setup charge current I(t) discriminates between the responsible states –even for a vanishing gap– by means of a Spin-Pauli blockade (SPB). We discuss how our setup preserves the states, how their distinct spatial profile causes different charging energies and such that a variation of the reservoirs chemical potentials allow the isolation of singlet/triplet signals.
Rather than considering only ensembles of measurements or repetitions, our setup allows for single-shot experiments simulated by Monte-Carlo trajectories. From relative frequencies, we estimate overhaul time-scale Δ t = 6 ℏ/Γ for a successful identification of the spin. For experiments on shorter time scales, we report on the fidelity and the necessary time for a confident identification of the state.
Keywords: Open-shell graphene nanoribbons; Half-filling singlet/triplet distinction; Spin-Pauli Blockade