One-sided stripe supersolidity from engineered non-axisymmetric dipolar interactions

• URL: http://arxiv.org/abs/2608.12867v1
• Date: Thu, 13 Aug 2026 06:32:38 GMT
• Title: One-sided stripe supersolidity from engineered non-axisymmetric dipolar interactions
• Abstract summary: We study a soft-core Bose-Hubbard model with isotropic hopping and an engineered non-axisymmetric dipolar interaction.<n>Keeping the same off-site kernel while increasing (U/t) toward the hard-core limit shows that the particle-side supersolid disappears once doublon-like defects are projected out.
• Score: 6.797500538719546
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A supersolid combines density order with phase coherence, and doped lattice solids ask whether added defects can become coherent without melting the ordered background. We study a soft-core Bose-Hubbard model with isotropic hopping and an engineered non-axisymmetric dipolar interaction, \(V_{ij}=V_2(x_{ij}^2-y_{ij}^2)/r_{ij}^5+W_6/r_{ij}^6\), where the sign-changing \(d_{x^2-y^2}\) component selects a fixed \((q,0)\) stripe channel and the \(W_6/r^6\) core stabilizes the short-distance attractive branch. Using sign-problem-free quantum Monte Carlo method with worm algorithm, we find that the half-filled stripe parent responds asymmetrically to doping: the hole side forms locked commensurate stripe solids with vanishing superfluid stiffness, whereas the particle side forms a stripe supersolid with finite compressibility \(κ>0\), finite superfluid stiffness \(ρ_s>0\), and enhanced double occupancy \(D\). Keeping the same off-site kernel while increasing \(U/t\) toward the hard-core limit shows that the particle-side supersolid disappears once doublon-like defects are projected out. Thus the engineered dipolar kernel selects the fixed \((q,0)\) stripe channel, while onsite softness selects the phase-coherent defect sector.

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