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

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

2006-03-15

arxiv.org/abs/cond-mat/0603401v3

Phys. Rev. B 74, 064429 (2006).

Physics

Condensed Matter

Strongly Correlated Electrons

slightly shortened and reorganized version

Scientific paper

10.1103/PhysRevB.74.064429

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.

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