Bond order wave instabilities in doped frustrated antiferromagnets: "Valence bond solids" at fractional filling

Abstract

We explore both analytically and numerically the properties of doped t-J models on a class of highly frustrated lattices, such as the kagome and the pyrochlore lattice. Focussing on a particular sign of the hopping integral and antiferromagnetic exchange, we find a generic symmetry breaking instability towards a twofold degenerate ground state at a fractional filling below half filling. These states show modulated bond strengths and only break lattice symmetries. They can be seen as a generalization of the well-known valence bond solid states to fractional filling.

slightly shortened and reorganized version

References in corpus (3)

• Numerical Contractor Renormalization Method for Quantum Spin Models
• Spin-Charge Separation in Two-dimensional Frustrated Quantum Magnets
• Enhanced pairing in doped quantum magnets with frustrating hole motion

Cited by in corpus (9)

• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Interaction-driven topological insulators on the kagome and the decorated honeycomb lattices
• Simplex solids in SU(N) Heisenberg models on the kagome and checkerboard lattices
• Weyl semimetal from spontaneous inversion symmetry breaking in pyrochlore oxides
• Visualizing symmetry-breaking electronic orders in epitaxial Kagome magnet FeSn films
• Numerical study of magnetization plateaux in the spin-1/2 Heisenberg antiferromagnet on the checkerboard lattice
• Contractor-Renormalization approach to frustrated magnets in magnetic field
• Plaquette bond order wave in the quarter-filled extended Hubbard model on the checkerboard lattice
• Chiral symmetry breaking through spontaneous dimerization in kagomé metals