期刊
PHYSICAL REVIEW B
卷 103, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.125137
关键词
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资金
- German Research Foundation (DFG) [RA 2990/1-1]
- DFG through the Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter -ct.qmat [EXC 2147, 39085490, SFB 1170]
- MEXT as Program for Promoting Researches on the Supercomputer Fugaku (Basic Science for Emergence and Functionality in Quantum Matter)
- MEXT as Program for Promoting Researches on the Supercomputer Fugaku (HPCI project) [HP200132]
- KANKEHI [16H16345]
- Gauss Centre for Supercomputing e.V.
Utilizing a cluster extension of dynamical mean-field theory (CDMFT), the magnetic phase diagram of anisotropic square lattice Hubbard model at half filling was mapped out, showing different metal-insulator transitions in various regions of the phase diagram.
Using a cluster extension of the dynamical mean-field theory (CDMFT) we map out the magnetic phase diagram of the anisotropic square lattice Hubbard model with nearest-neighbor intrachain t and interchain t(perpendicular to) hopping amplitudes at half filling. A fixed value of the next-nearest-neighbor hopping t' = -t(perpendicular to)/2 removes the nesting property of the Fermi surface and stabilizes a paramagnetic metal phase in the weak-coupling regime. In the isotropic and moderately anisotropic regions, a growing spin entropy in the metal phase is quenched out at a critical interaction strength by the onset of long-range antiferromagnetic (AF) order of preformed local moments. It gives rise to a first-order metal-insulator transition consistent with the Mott-Heisenberg picture. In contrast, a strongly anisotropic regime t(perpendicular to)/t less than or similar to 0.3 displays a quantum critical behavior related to the continuous transition between an AF metal phase and the AF insulator. Hence, within the present framework of CDMFT, the opening of the charge gap is magnetically driven as advocated in the Slater picture. We also discuss how the lattice-anisotropy-induced evolution of the electronic structure on a metallic side of the phase diagram is tied to the emergence of quantum criticality.
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