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Topological origin of equatorial waves

Published on : February 19, 2018

Topology sheds new light on the emergence of unidirectional edge waves in a variety of physical systems, from condensed matter to artificial lattices.

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Waves observed in geophysical flows are also robust to perturbations, which suggests a role for topology. We show a topological origin for two celebrated equatorially trapped waves known as Kelvin and Yanai modes, due to the Earth's rotation that breaks time-reversal symmetry. The non-trivial structure of the bulk Poincar\'e wave modes encoded through the first Chern number of value 2 guarantees existence for these waves. This invariant demonstrates that ocean and atmospheric waves share fundamental properties with topological insulators, and that topology plays an unexpected role in the Earth climate system.

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Topological origin of Equatorial waves, Pierre Delplace, J. B. Marston et Antoine Venaille, Science (2017)
doi: 10.1126/science.aan8819


Antoine Venaille, chercheur CNR
Pierre Delplace, chercheur CNRS

Laboratoire de physique à l’ENS de Lyon

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