Insulator-metal transition and quasi-flat-band of Shastry-Sutherland lattice

Abstract

Insulator-metal transition is investigated self-consistently on the frustrated Shastry-Sutherland lattice in the framework of Slave-Boson mean-field theory. Due to the presence of quasi-flat band structure characteristic, the system displays a spin-density-wave (SDW) insulating phase at the weak doping levels, which is robust against frustration, and it will be transited into an SDW metallic phase at high doping levels. As further increasing the doping, the temperature or the frustration on the diagonal linking bonds, the magnetic order $m$ will be monotonically suppressed, resulting in the appearance of a paramagnetic metallic phase. Although the Fermi surface of the SDW metallic phase may be immersed by temperature, the number of mobile charges is robust against temperature at weak doping levels.

8 pages, 10 figures

References in corpus (11)

• Band geometry, Berry curvature and superfluid weight
• Fractional magnetization plateaus and magnetic order in the Shastry Sutherland magnet TmB4
• Yb${}_2$Pt${}_2$Pb: Magnetic frustration in the Shastry-Sutherland lattice
• NMR evidence for the persistence of spin-superlattice above the 1/8 magnetization plateau in SrCu2(BO3)2
• Strong competition between orbital-ordering and itinerancy in a frustrated spinel vanadate
• In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu(2-x)Mgx(BO3)2
• Plaquette bond order wave in the quarter-filled extended Hubbard model on the checkerboard lattice
• Unconventional Superconducting Symmetry in a Checkerboard Antiferromagnet
• Identifying topological order in the Shastry-Sutherland model via entanglement entropy
• Spin-polaron excitations in a doped Shastry-Sutherland model
• Dimer-induced heavy-fermion superconductivity in the Shastry-Sutherland Kondo lattice model