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Particle-hole symmetry and interaction effects in the Kane-Mele-Hubbard model
2011
Physical Review B
We prove that the Kane-Mele-Hubbard model with purely imaginary next-nearest-neighbor hoppings has a particle-hole symmetry at half-filling. Such a symmetry has interesting consequences including the absence of charge and spin currents along open edges, and the absence of the sign problem in the determinant quantum Monte-Carlo simulations. Consequentially, the interplay between band topology and strong correlations can be studied at high numeric precisions. The process that the topological band
doi:10.1103/physrevb.84.205121
fatcat:77v5sshhijdabmygz5mkgdzlh4