SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 22: Atomic Clusters (joint session A/MO)
A 22.5: Talk
Thursday, March 9, 2023, 12:15–12:30, F107
Quantum nanofriction in trapped ion chains with a topological defect — •Lars Timm1, Luca A. Rüffert2, Hendrik Weimer1,3, Luis Santos1, and Tanja E. Mehlstäubler2,4 — 1Institut für Theoretische Physik, Appelstr. 2, 30167 Hannover — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig — 3Institut für Theoretische Physik, Hardenbergstr. 36, 10623 Berlin — 4Institut für Quantenoptik, Welfengarten 1, 30167 Hannover
After an introduction into the fundamental properties of the Frenkel-Kontorova model, one of the paradigmatic models of nanofriction, I will present the observation of a sliding to pinned transition with the help of a topological defect inside a two-dimensional self-assembled ion crystal. Subsequently, I shortly introduce one major consequence of this so-called Aubry transition, i.e. the localization of energy in the pinned phase of the defect. In the main part of my talk I discuss the quantized version of the Frenkel-Kontorova model and the consequences for the Aubry transition inside an ion crystal. As for that matter, we make use of a simple single particle formalism treating the defect as a quasiparticle, which captures the important dynamics of the defect close to the Aubry transition. This convenient approach gives access to its quantum properties revealing its quantum tunneling on a micron length-scale in a range of trap configurations and lets us identify a transition into a quasi-classical regime away from the transition point. Lastly, we give estimates for the temperature requirements and strategies to observe these effects in an experiment.