232 citations · 1.5k across the 53 of their papers we have counts for
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cond-mat.stat-mech2001★ 107 cited
Order Parameter to Characterize Valence-Bond-Solid States in Quantum Spin Chains
Masaaki Nakamura, Synge Todo
We propose an order parameter to characterize valence-bond-solid (VBS) states in quantum spin chains, given by the ground-state expectation value of a unitary operator appearing in…
cond-mat.str-el2001★ 65 cited
Lattice Twisting Operators and Vertex Operators in Sine-Gordon Theory in One Dimension
Masaaki Nakamura, Johannes Voit
In one dimension, the exponential position operators introduced in a theory of polarization are identified with the twisting operators appearing in the Lieb-Schultz-Mattis argument…
cond-mat.str-el2001★ 11 cited
Exact Bond-Located Spin Ground State in the Hubbard Chain with Off-Diagonal Coulomb Interactions
Kazuhito Itoh, Masaaki Nakamura, Norihiro Muramoto
We show the existence of an exact ground state in certain parameter regimes of one-dimensional half-filled extended Hubbard model with site-off-diagonal interactions. In this groun…