Soliton binding and low-lying singlets in frustrated odd-legged S=1/2 spin tubes

Details Soliton binding and low-lying singlets in frustrated odd-legged S=1/2 spin tubes Soliton binding and low-lying singlets in frustrated odd-legged S=1/2 spin tubes

2004-05-07

arxiv.org/abs/cond-mat/0405131v1

Phys. Rev. B 70, 060405 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.060405

Motivated by the intriguing properties of the vanadium spin tube Na2V3O7, we show that an effective spin-chirality model similar to that of standard Heisenberg odd-legged S=1/2 spin tubes can be derived for frustrated inter-ring couplings, but with a spin-chirality coupling constant alpha that can be arbitrarily small. Using density matrix renormalization group and analytical arguments, we show that, while spontaneous dimerization is always present, solitons become bound into low-lying singlets as alpha is reduced. Experimental implications for strongly frustrated tubes are discussed.

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