Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice
Source abstract
Abstract
We investigate electron correlations in the two-dimensional Hubbard model on the planar pyrochlore lattice. By means of variational Monte Carlo simulations, we discuss how stable the paramagnetic semi-metallic state is at half-filling. It is found that the increase of the Coulomb interaction induces the first-order transition around U/t∼9, where the magnetically ordered state is more stable than the Mott insulating phase without symmetry breaking.
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Research context
OpenAlex topics: Advanced Condensed Matter Physics · Physics of Superconductivity and Magnetism · Rare-earth and actinide compounds
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References (11)
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1. Kondo · Phys. Rev. Lett. · 1997 · 78 · 372910.1103/PhysRevLett.78.3729 ↗
2. Sakai · J. Phys. Soc. Japan · 2002 · 71 · 42210.1143/JPSJ.71.422 ↗
3. Fujimoto · Phys. Rev. Lett. · 2002 · 89 · 22640210.1103/PhysRevLett.89.226402 ↗
4. Yoshioka · Physica B · 2006 · 378–380 · 29410.1016/j.physb.2006.01.108 ↗
5. Fouet · Phys. Rev. B · 2003 · 67 · 05441110.1103/PhysRevB.67.054411 ↗
6. Yokoyama · J. Phys. Soc. Japan · 1987 · 56 · 149010.1143/JPSJ.56.1490 ↗
7. Yokoyama · J. Phys. Soc. Japan · 1990 · 59 · 366910.1143/JPSJ.59.3669 ↗
8. Kaplan · Phys. Rev. Lett. · 1982 · 49 · 88910.1103/PhysRevLett.49.889 ↗
9. Fazekas · Int. J. Mod. Phys. B · 1988 · 2 · 102110.1142/S0217979288000858 ↗
10. Giamarchi · Phys. Rev. B · 1991 · 43 · 1294310.1103/PhysRevB.43.12943 ↗
11. Although several gap functions for each band have been chosen such as Δk=Δ,Δ(coskx±cosky),Δsinkxsinky, we could not find that Δk is relevant in the system.