Self-Organized Stabilization of Straight Dark Solitons in Stripe Supersolids

Koushik Mukherjee; Hiroki Saito

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arXiv · 2606.25687

Self-Organized Stabilization of Straight Dark Solitons in Stripe Supersolids

Koushik Mukherjee·Hiroki Saito

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Abstract

Straight dark solitons in two-dimensional (2D) quantum fluids usually decay by transverse modulational instability, with no intrinsic suppression in contact-interacting Bose--Einstein condensates (BECs). We theoretically show that anisotropic long-range interactions in a quasi-2D dipolar BEC stabilize an embedded straight soliton, with spontaneous stripe order providing stronger pinning. The excitation spectra show that the lowest transverse solitonic branch remains gapped, while stripe-supersolid density modulation further hardens this branch and increases the soliton bending stiffness, penalizing transverse deformation. Accessible in current $^{166}$Er and $^{164}$Dy platforms, these results establish interaction-driven protection for straight dark solitons in structured quantum fluids.

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Koushik Mukherjee, Hiroki Saito. 2026-06-24. Self-Organized Stabilization of Straight Dark Solitons in Stripe Supersolids. https://arxiv.org/abs/2606.25687

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