Regensburg 2022 – wissenschaftliches Programm

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PRV: Preisträgervorträge

PRV II

PRV II: Preisträgervortrag

Dienstag, 6. September 2022, 13:15–13:45, H2

Water flows in carbon nanochannels: from quantum friction to carbon memories — •Lydéric Bocquet — Laboratoire de Physique, Ecole Normale Supérieure and CNRS, Paris — Laureate of the Gentner-Kastler-Prize 2022

In this talk, I will discuss various experimental and theoretical results that we obtained recently on the transport of water and ions in ultra-confinement. I will in particular focus on the odd properties of the water-carbon couple, which highlights a variety of strange transport properties. I will first discuss the ultra-fast, and radius dependent, flows of water in carbon nano-structures [1]. We demonstrate that this phenomenon is a consequence of an unconventional quantum friction at the water-carbon interface, taking its root in the coupling between water collective modes with electronic excitations [2]. I will then explore far from equilibrium transport of ions across quasi two-dimensional slits. We predict that under an electric field, ions assemble into elongated clusters - as a consequence of a 2D Wien effect -, whose slow dynamics results in the emergence of long-term memory [3]. This phenomenon, known as the memristor effect, can be harnessed to build an elementary neuron. Experimental demonstrations of this effect in the 2D nanochannels allow for the development of elementary ion-based computing, with basic forms of Hebbian learning [4].

References [1] E. Secchi, et al. , Nature 537 210 (2016) [2] N. Kavokine, M.-L. Bocquet and L. Bocquet, Nature, 602, 84-90 (2022) [3] P. Robin, N. Kavokine, and L. Bocquet, Science, 373, 687-691 (2021) [4] P. Robin, et al., submitted (2022).