Emergence of Resonating Valence-Bond Correlations in Stretched Graphene

• URL: http://arxiv.org/abs/2606.18973v1
• Date: Wed, 17 Jun 2026 11:55:58 GMT
• Title: Emergence of Resonating Valence-Bond Correlations in Stretched Graphene
• Abstract summary: tensile expansion of the honeycomb lattice provides a direct route to enhancing correlation effects.<n>Results provide direct many-body evidence that lattice expansion drives graphene into a regime where RVB-like correlations become energetically favorable.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Electronic correlations in graphene are generally considered weak due to the large bandwidth of its $π$ electrons. Here we show that tensile expansion of the honeycomb lattice provides a direct route to enhancing correlation effects. Using variational and diffusion quantum Monte Carlo, we compare a conventional Jastrow-Slater determinant wave function with a resonating-valence-bond (RVB) Jastrow-antisymmetrized geminal product ansatz for a series of stretched graphene lattices. We find that the energy gain of the RVB state relative to the single-determinant description increases with bond expansion up to a critical strain $δ_{\mathrm{cr}}$, and decreases beyond it, revealing a nonmonotonic evolution of electronic correlations. The crossover is found to occur in the range $15\% < δ_{\mathrm{cr}} < 20\%$, in agreement with mechanical stability limits. This behavior indicates a transition from a weakly correlated Dirac semimetal to a regime with enhanced non-dynamic correlation and short-range singlet pairing. Our results provide direct many-body evidence that lattice expansion drives graphene into a regime where RVB-like correlations become energetically favorable, offering a simple route to tuning correlation effects in Dirac materials.

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