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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 11: Focus Session: (Multi-)Ferroic States II
KFM 11.7: Talk
Tuesday, March 19, 2024, 12:00–12:20, EMH 225
Brownian Electric Bubbles — •Hugo Aramberri1 and Jorge Íñiguez-González1,2 — 1Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg — 2University of Luxembourg, Belvaux, Luxembourg
Magnetic skyrmions are point-like topological defects with a magnetization opposite to its embedding matrix. They have been studied for over a decade. Some of their most promising applications are in the field of unconventional computing, in which the stochastic motion of these nanometric objects plays a pivotal role. At the same time, electric skyrmion bubbles were recently predicted (and soon after experimentally confirmed) in electrostatically frustrated ferroelectrics. However, the field of electric bubbles is still at a nascent stage, and a fundamental characterization of these objects is still lacking. Importantly, the dynamics of electric bubbles still remain largely unexplored.
In this talk I will present second-principles atomistic molecular dynamics simulations of electric bubbles in ferroelectric/paraelectric superlattices (PbTiO3/SrTiO3), showing that they can present Brownian motion at room temperature. This work establishes the quasiparticle nature of electric bubbles, and sets the stage for their use as purely electric alternatives to magnetic skyrmions.
Aramberri and Íñiguez, arXiv:2308.01716 (2023).
Keywords: Electric skyrmion; Ferroelectric/dielectric superlattices; Oxides; Brownian particles