期刊
PHYSICAL REVIEW B
卷 102, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.035157
关键词
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资金
- Spanish Ministry of Science, Innovation and Universities MICINN/FEDER, Union Europea [RTI2018-098452-B-I00]
- Maria de Maeztu Programme for Units of Excellence in RD [CEX2018-000805-M]
We study the interplay between spin-orbit coupling (SOC) and Coulomb repulsion in a Hubbard model on a decorated honeycomb lattice which leads to a plethora of phases. While a quantum spin Hall insulator is stable at weak Coulomb repulsion and moderate SOC, a semimetallic phase emerges at large SOC in a broad range of Coulomb repulsion. This semimetallic phase has topological properties such as a finite, nonquantized spin Hall conductivity not observed in conventional metals. At large Coulomb repulsion and negligible spin-orbit coupling, electronic correlations stabilize a resonance valence bond (RVB) spin liquid state in contrast to the classical antiferromagnetic state predicted by mean-field theory. Under sufficiently strong SOC, such RVB state is transformed into a magnetic insulator consisting on S less than or similar to 3/2 localized moments on a honeycomb lattice with antiferromagnetic order and topological features.
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