Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Focus Session: Novel mechanisms of ferroic switching (joint session MA/FM)

MA 4.2: Hauptvortrag

Montag, 9. März 2026, 10:00–10:30, POT/0151

Topological order parameter switching — •Sergey Artyukhin — Quantum Materials Theory, Genova, Italy

Ferroic orders are widely used to encode information in data storage devices and may provide a beneficial way to circumvent Boltzmann tyranny affecting conventional MOSFET memory [1]. However, information writing involves order parameter switching, facilitated by domain nucleation and motion of domain walls across a disordered material, which leads to energy dissipation. Recently, an alternative order parameter switching paradigm has been introduced, where the ordered state tracking the free energy minimum continuously rotates the order parameter direction as the free energy surface is deformed by an external driving [2]. The process is analogous to Thouless pumping and is topologically protected. A related mechanism allows pumping of topological spin textures in space [3].

[1] S. Manipatruni, D. E. Nikonov, I. A. Young, Nature Physics 14, 338 (2018)

[2] L. Ponet et al., Nature 607, 81-85 (2022)

[3] L. Maranzana et al., arXiv:2502.13083

Keywords: order parameter; ferroic switching; Thouless pump; domain walls