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Motivated by the intriguing properties of the vanadium spin tube Na2V3O7, weshow that an effective spin-chirality model similar to that of standardHeisenberg odd-legged S=1/2 spin tubes can be derived for frustrated inter-ringcouplings, but with a spin-chirality coupling constant alpha that can bearbitrarily small. Using density matrix renormalization group and analyticalarguments, we show that, while spontaneous dimerization is always present,solitons become bound into low-lying singlets as alpha is reduced. Experimentalimplications for strongly frustrated tubes are discussed.Comment: 4 pages, 4 figure

physical review. b, condensed matter and materials physics

Soliton binding and low-lying singlets in frustrated odd-legged<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mstyle scriptlevel="1"><mml:mfrac bevelled="false"><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mstyle></mml:mrow></mml:math>spin tubes

Soliton binding and low-lying singlets in frustrated odd-leggedS=12spin tubes