TY - JOUR
T1 - Intermediate and spin-liquid phase of the half-filled honeycomb Hubbard model
AU - Chen, Qiaoni
AU - Booth, George H.
AU - Sharma, Sandeep
AU - Knizia, Gerald
AU - Chan, Garnet Kin Lic
PY - 2014/4/28
Y1 - 2014/4/28
N2 - We obtain the phase diagram of the half-filled honeycomb Hubbard model with density matrix embedding theory, to address recent controversy at intermediate couplings. We use clusters from 2-12 sites and lattices at the thermodynamic limit. We identify a paramagnetic insulating state, with possible hexagonal cluster order, competitive with the antiferromagnetic phase at intermediate coupling. However, its stability is strongly cluster and lattice size dependent, explaining controversies in earlier work. Our results support the paramagnetic insulator as being a metastable, rather than a true, intermediate phase, in the thermodynamic limit.
AB - We obtain the phase diagram of the half-filled honeycomb Hubbard model with density matrix embedding theory, to address recent controversy at intermediate couplings. We use clusters from 2-12 sites and lattices at the thermodynamic limit. We identify a paramagnetic insulating state, with possible hexagonal cluster order, competitive with the antiferromagnetic phase at intermediate coupling. However, its stability is strongly cluster and lattice size dependent, explaining controversies in earlier work. Our results support the paramagnetic insulator as being a metastable, rather than a true, intermediate phase, in the thermodynamic limit.
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U2 - 10.1103/PhysRevB.89.165134
DO - 10.1103/PhysRevB.89.165134
M3 - Article
AN - SCOPUS:84899710944
SN - 1098-0121
VL - 89
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 16
M1 - 165134
ER -