Huffman, EF; Chandrasekharan, S, *Solution to sign problems in half-filled spin-polarized electronic
systems*,
Phys. Rev. B, vol. 89
(October, 2013),
pp. 111101 [1311.0034v1], [doi] .
**Abstract:**

*We solve the sign problem in a particle-hole symmetric spin-polarized fermion
model on bipartite lattices using the idea of fermion bags. The solution can be
extended to a class of models at half filling but without particle-hole
symmetry. Attractive Hubbard models with an odd number of fermion species can
also be solved. The new solutions should allow us to study quantum phase
transitions that have remained unexplored so far due to sign problems.*