Author

W. Janke

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Preprint Sep 2026

Accurate ground-state entropies from population Monte Carlo: The antiferromagnetic Ising model on the Shastry-Sutherland lattice

We demonstrate how the population annealing Monte Carlo simulation method can be used to compute the ground-state entropy to high precision. This approach is tested for the classical antiferromagnetic Ising model on the Shastry-Sutherland lattice with diagonal couplings chosen twice as strong as the nearest-neighbor in...

D. Gessert, W. Janke, Martin Weigel · 0 citations

Preprint Aug 2026

Meandering stripes in the frustrated $J_1$-$J_2$ Ising model on the honeycomb lattice

We study the frustrated $J_1$-$J_2$ Ising model on the honeycomb lattice with ferromagnetic nearest-neighbor couplings fixed at $J_1=1$ and strong antiferromagnetic next-nearest-neighbor interactions, i.e., $J_2 \leq -1/4$. Little is known for this range of $J_2$, whereas for less negative values of $J_2$ the system or...

D. Gessert, Martin Weigel, W. Janke · 1 citation