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Robust quantum valley Hall effect for vortices in an interacting bosonic quantum fluid

Abstract : Topologically protected pseudospin transport, analogous to the quantum spin Hall effect, cannot be strictly implemented for photons and in general bosons because of the lack of symmetry-protected pseudospins. Here we show that the required protection can be provided by the real-space topological excitation of an interacting quantum fluid: a quantum vortex. We consider a Bose-Einstein condensate at the Gamma point of the Brillouin zone of a quantum valley Hall system based on two staggered honeycomb lattices. We demonstrate the existence of a coupling between the vortex winding and the valley of the bulk Bloch band. This leads to chiral vortex propagation on each side of the zigzag interface between two regions of inverted staggering. The topological protection provided by the vortex winding prevents valley pseudospin mixing and resonant backscattering, allowing a truly topologically protected valley pseudospin transport.
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https://hal.uca.fr/hal-01914206
Contributor : Christophe Tournayre Connect in order to contact the contributor
Submitted on : Tuesday, November 6, 2018 - 5:22:38 PM
Last modification on : Monday, November 22, 2021 - 1:46:26 PM

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Olivier Bleu, Guillaume Malpuech, D. Solnyshkov. Robust quantum valley Hall effect for vortices in an interacting bosonic quantum fluid. Nature Communications, Nature Publishing Group, 2018, 9, pp.3991. ⟨10.1038/s41467-018-06520-7⟩. ⟨hal-01914206⟩

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