Speaker
Evan Berkowitz
(Forschungszentrum Jülich)
Description
The Hubbard model is a foundational model of condensed matter physics. Formulated on a honeycomb lattice it provides a crude model for graphene; on a square lattice it may model high-Tc superconductors. I will present first-principles numerical results characterizing the quantum phase transition of the Hubbard model on a honeycomb lattice between a Dirac semimetal to an antiferromagnetic Mott insulator, and then present some results away from half-filling, where the model develops a sign problem.
Phase transition:
2005.11112 Phys.Rev.B 102 (2020) 24, 245105
2105.06936 Phys.Rev.B 104 (2021) 15, 155142
Sign problem:
2006.11221 Phys.Rev.B 103 (2021) 12, 125153
2203.00390 Phys.Rev.B 106 (2022) 12, 125139
Primary author
Evan Berkowitz
(Forschungszentrum Jülich)