Effects of interaction strength, doping, and frustration on the antiferromagnetic phase of the two-dimensional Hubbard model

Fratino, L.; Charlebois, M.; Sémon, P.; Sordi, G.; Tremblay, A. -M.  S.

doi:10.1103/PhysRevB.96.241109

Title: Effects of interaction strength, doping, and frustration on the antiferromagnetic phase of the two-dimensional Hubbard model

Journal Article · 19 December 2017 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.96.241109 · OSTI ID:1425185

Fratino, L. ^[1]; Charlebois, M. ^[2]; Sémon, P. ^[3]; Sordi, G. ^[1]; Tremblay, A. -M. S. ^[4]

Univ. of London, Egham, Surrey (United Kingdom). Dept. of Physics, Royal Holloway
Univ. de Sherbrooke, Sherbrooke, QC (Canada). Dept. de Physique, Institut Quantique, and Regroupement Quebecois sur les Materiaux de Pointe
Brookhaven National Lab. (BNL), Upton, NY (United States). Computational Science Initiative
Univ. de Sherbrooke, Sherbrooke, QC (Canada). Dept. de Physique, Institut Quantique, and Regroupement Quebecois sur les Materiaux de Pointe; Canadian Inst. for Advanced Research, Toronto, ON (Canada)

Recent quantum-gas microscopy of ultracold atoms and scanning tunneling microscopy of the cuprates reveal new detailed information about doped Mott antiferromagnets, which can be compared with calculations. Using cellular dynamical mean-field theory, we map out the antiferromagnetic (AF) phase of the two-dimensional Hubbard model as a function of interaction strength U, hole doping δ, and temperature T . The Néel phase boundary is nonmonotonic as a function of U and δ. Frustration induced by second-neighbor hopping reduces Néel order more effectively at small U. The doped AF is stabilized at large U by kinetic energy and at small U by potential energy. The transition between the AF insulator and the doped metallic AF is continuous. At large U, we find in-gap states similar to those observed in scanning tunneling microscopy. Finally, we predict that, contrary to the Hubbard bands, these states are only slightly spin polarized.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), International Nuclear Energy Policy and Cooperation

Grant/Contract Number:: SC0012704

OSTI ID:: 1425185

Report Number(s):: BNL-203252-2018-JAAM; PRBMDO; TRN: US1802061

Journal Information:: Physical Review B, Vol. 96, Issue 24; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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