108 citations · 1k across the 67 of their papers we have counts for
5 papers · 1 filter
Fractional skyrmion and absence of low-lying Andreev bound states in a micro fractional-flux quantum vortex
Takashi Yanagisawa, Yoichi Higashi, Izumi Hase
We investigate quasi-particle excitation modes and the topological number of a fractional-flux quantum vortex in a layered (multi-component) superconductor. The Bogoliubov equation…
Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems
Takashi Yanagisawa
It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. This paper is a short review article on the mechanism of high…
Antiferromagnetism, Superconductivity and Phase Diagram in the Two-Dimensional Hubbard Model -- Off-Diagonal Wave Function Monte Carlo Studies of Hubbard Model III --
Takashi Yanagisawa
We investigate the ground-state phase diagram of the two-dimensional Hubbard model based on the optimization variational Monte Carlo method. We use a wave function that is an off-d…
Green's functions of Nambu-Goldstone modes and Higgs modes in superconductors
Takashi Yanagisawa
We examine fundamental properties of Green's functions of Nambu-Goldstone and Higgs modes in superconductors with multiple order parameters. Nambu-Goldstone and Higgs modes are det…
Renormalization group analysis of the hyperbolic sine-Gordon model -- Asymptotic freedom from cosh interaction --
Takashi Yanagisawa
We present a renormalization group analysis for the hyperbolic sine-Gordon (sinh-Gordon) model in two dimensions. We derive the renormalization group equations based on the dimensi…