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Winding number order in the Haldane model with interactions

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Figure

Figure 1. ((momentuma) Honeycomb lattice model depicting the nearest neighbor, t, next-nearest–neighbor hoppings, ta b, , and the interaction U.b) Lattice unit cell and indices of sites
Figure 3. (tvariousseparation,a) and (b) Winding number as a function of the imparted phase Φ and the nearest neighbor interaction, U, using=1,ta= -tb=0.1
Figure 4. Results from the BCS ansatz. Inthe BCS ansatzappears. Note that this happens well below the line figures (b)–(d) we plot the absolute value of the order parameters, wk for k=1, 2, 3, from (26), while figure (a) shows the the norm ∣ ∣d

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