653 citations · 2.2k across the 53 of their papers we have counts for
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cond-mat.stat-mech2010★ 3 cited
Theorems on ground-state phase transitions in Kohn-Sham models given by the Coulomb density functional
Koichi Kusakabe, Isao Maruyama
Some theorems on derivatives of the Coulomb density functional with respect to the coupling constant are given. Consider an electron density given by a ground…
cond-mat.stat-mech2008★ 1 cited
Gap Estimation by means of Hyperbolic Deformation
Hiroshi Ueda, Hiroki Nakano, Koichi Kusakabe +1
We present a way of numerical gap estimation applicable for one-dimensional infinite uniform quantum systems. Using the density matrix renormalization group method for a non-unifor…
cond-mat.stat-mech1998★ 10 cited
A gapless charge mode induced by the boundary states in the half-filled Hubbard open-chain
Tetsuo Deguchi, Ruihong Yue, Koichi Kusakabe
We discuss the ground state and some excited states of the half-filled Hubbard model defined on an open chain with L sites, where only one of the boundary sites has a different val…