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arXiv · 2507.15561

Vortices in dipolar condensates of interlayer excitons

Sara Conti·Andrey Chaves·Luis A. Pena Ardila·David Neilson·Milorad V. Milosevic
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Abstract

Recently observed signatures of Bose-Einstein condensation and superfluidity of dipolar excitons have drawn enormous attention to excitonic semiconductor bilayers. In superfluids, stabilization and observation of vortex matter is usually a decisive proof of coherent condensation order. However to date, the vortex behavior in a 2D excitonic system with aligned dipole-like interactions that are long-range and everywhere repulsive has not been addressed. We here provide a theoretical description of the vortex characteristics, interaction, and lattices in a dipolar exciton superfluid, solving the corresponding Gross-Pitaevskii equation, while varying the exciton dipole moments and the exciton density - both tunable in the experiment, by interlayer separation and gating, respectively. We draw particular attention to the appearance of a maximum in the density redistribution around the edge of each vortex, in the phase-space region where the dipole interactions are particularly strong, and where a transition to an incompressible exciton supersolid is expected.

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Sara Conti, Andrey Chaves, Luis A. Pena Ardila, David Neilson, Milorad V. Milosevic. 2025-07-21. Vortices in dipolar condensates of interlayer excitons. https://arxiv.org/abs/2507.15561

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