110 citations · 490 across the 29 of their papers we have counts for
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cond-mat1997★ 6 cited
Haldane and dimer gap in general double spin-chain models
Tota Nakamura, Satoshi Takada, Kiyomi Okamoto +1
We have obtained an analytic expression for the dependence of excitation energy gap for an arbitrary double spin-chain by using the nonlocal unitary transformation and…
cond-mat1996★ 5 cited
Behavior of a frustrated quantum spin chain with bond dimerization
Tota Nakamura, Satoshi Takada
We clarified behavior of the excitation gap in a frustrated S=1/2 quantum spin chain with bond dimerization by using the numerical diagonalization of finite systems and a variation…
cond-mat1996★ 12 cited
Relaxation of frustration and gap enhancement by the lattice distortion in the chain
Tota Nakamura, Satoshi Takada
We clarify an instability of the ground state of the chain against the lattice distortion that increases a strength of a bond in each triangle. It relaxes the frustration…