420 citations · 1.2k across the 34 of their papers we have counts for
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H-wave -- A Python package for the Hartree-Fock approximation and the random phase approximation
Tatsumi Aoyama, Kazuyoshi Yoshimi, Kota Ido +5
H-wave is an open-source software package for performing the Hartree--Fock approximation (HFA) and random phase approximation (RPA) for a wide range of Hamiltonians of interacting…
Gap opening mechanism for correlated Dirac electrons in organic compounds -(BEDT-TTF)I and -(BEDT-TSeF)I
Daigo Ohki, Kazuyoshi Yoshimi, Akito Kobayashi +1
To determine how electron correlations open a gap in two-dimensional massless Dirac electrons in the organic compounds -(BEDT-TTF)I [-(ET)I] and -(BEDT-TSe…
Fragment-orbital-dependent spin fluctuations in the single-component molecular conductor [Ni(dmdt)]
Taiki Kawamura, Akito Kobayashi
Motivated by recent nuclear magnetic resonance experiments, we calculated the spin susceptibility, Knight shift, and spin-lattice relaxation rate () of the single-compone…
Possible Spin-Density Wave on Fermi Arc of Edge State in Single-Component Molecular Conductors [Pt(dmdt)] and [Ni(dmdt)]
Taiki Kawamura, Biao Zhou, Akiko Kobayashi +1
We construct three-orbital tight-binding models describing single-component molecular conductors [Pt(dmdt)] and [Ni(dmdt)] using first-principles calculations. We show that…
Anomalous Spin Correlations and Mass-Generating Excitonic Instability of Interacting Weyl Fermions
Michihiro Hirata, Kyohei Ishikawa, Genki Matsuno +5
Recent advances in the study of nodal Weyl fermions (WFs), quasi-relativistic massless particles, constitute a novel realm of quantum many-body phenomena. The Coulomb interaction i…
Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
Michihiro Hirata, Kyohei Ishikawa, Kazuya Miyagawa +6
The Coulomb interaction among massless Dirac fermions in graphene is unscreened around the isotropic Dirac points, causing a logarithmic velocity renormalization and a cone reshapi…
Edge States in Molecular Solid α-(BEDT-TTF)2I3: Effects of Electron Correlations
Yukiko Omori, Genki Matsuno, Akito Kobayashi
We examine the edge states of the Dirac electrons in the molecular material α-(BEDT-TTF)2I3 with electron-electron interactions. Based on the analysis of the extended Hubbard model…
Electronic Properties Close to Dirac Cone in Two-Dimensional Organic Conductor -(BEDT-TTF)I
Shinya Katayama, Akito Kobayashi, Yoshikazu Suzumura
A zero-gap state (ZGS) has been found in a bulk system of two-dimensional organic conductor, -(BEDT-TTF)I salt which consists of four sites of donor molecules in a unit…
Role of Interlayer Electron Hopping for Spin Density Wave State in the Zero-Gap Organic Conductor
Shinya Katayama, Akito Kobayashi, Yoshikazu Suzumura
We investigate the formation of density waves in the zero-gap state (ZGS) which has been found in the quasi-two-dimensional organic conductor -(BEDT-TTF)I salt under the…
Detailed Structure of the Magnetic Excitation Spectra of YBa2Cu3Oy and Its Implication on the Physical Characteristics of the Electron System
Masafumi Ito, Hiroshi Harashina, Yukio Yasui +5
Detailed structure of the magnetic excitation spectra x"(q,w) of the superconducting oxide YBa2Cu3O6.5(the transition temperature Tc ~ 52 K) in the wave vector (q)- and the energy(…