420 citations · 1.2k across the 34 of their papers we have counts for
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Interaction-induced quantum spin Hall insulator in the organic Dirac electron system -(BEDT-TSeF)I
Daigo Ohki, Kazuyoshi Yoshimi, Akito Kobayashi
Focusing on the recently-discovered candidate topological insulator -(BEDT-TSeF)I -- having two-dimensional charge-neutral Dirac cones in a low symmetry lattice -- we co…
Tight-Binding Model and Electronic Property of Dirac Nodal Line in Single-Component Molecular Conductor [Pt(dmdt)]
Taiki Kawamura, Daigo Ohki, Biao Zhou +2
Motivated by the recent discovery of Dirac nodal line in the single-component molecular conductor [Pt(dmdt)], we propose a three-orbital tight-binding model based on the Wann…
Impact of impurity scattering on odd-frequency spin-triplet pairing near the edge of the Kitaev chain
Sparsh Mishra, Shun Tamura, Akito Kobayashi +1
We study a Kitaev chain model, which is the simplest model of topological superconductors hosting Majorana fermion, appearing as a zero-energy state at the edge. We analytically ca…
Transport properties of organic Dirac electron system α-(BEDT-TSeF)I
Daigo Ohki, Kazuyoshi Yoshimi, Akito Kobayashi
Motivated by the insulating behavior of -(BEDT-TSeF)I at low temperatures ('s), we first performed first-principles calculations based on the crystal structural data…
Effect of Coulomb Interaction on Seebeck Coefficient of Organic Dirac Electron System -(BEDT-TTF)I
Daigo Ohki, Yukiko Omori, Akito Kobayashi
Motivated by the results of recent thermoelectric effect studies, we show the effects of Coulomb interactions on the Seebeck coefficient based on an extended Hubbard model that des…
Domain Wall Conductivity with strong Coulomb interaction of two-dimensional massive Dirac Electrons in the Organic Conductor -(BEDT-TTF)I
Daigo Ohki, Yukiko Omori, Akito Kobayashi
Motivated by the results of recent transport and optical conductivity studies, we propose a semi-infinite two-dimensional lattice model for interacting massive Dirac electrons in t…
Effects of Zeroline and Ferrimagnetic Fluctuation on Nuclear Magnetic Resonance for Dirac Electrons in Molecular Conductor alpha-(BEDT-TTF)2I3
Akito Kobayashi, Yoshikazu Suzumura
We re-examine the wave function of two-dimensional massless Dirac electron in alpha-(BEDT-TTF)2I3 consisting of four molecules A, A', B and C in a unit cell, using a tight-binding…
Berry Curvature of the Dirac Particle in -(BEDT-TTF)I
Yoshikazu Suzumura, Akito Kobayashi
We examine several properties of the Berry curvature for the organic conductor -(BEDT-TTF)I consisting of four bands, which exhibits a zero-gap state with Dirac cones. B…
Emergence of Dirac Electron Pair in Charge Ordered State of Organic Conductor -(BEDT-TTF)I
A. Kobayashi, Y. Suzumura, F. Piéchon +1
We re-examine the band structure of the stripe charge ordered state of -(BEDT-TTF)I under pressure by using an extended Hubbard model within the Hartree mean-field theor…
Dirac Electrons in Molecular Solids
Hidetoshi Fukuyama, Akito Kobayashi, Yoshikazu Suzumura
Electrons in solids are characterized by the energy bands, which indicate that electrons are considered to be "elementary particles" with specific effective masses and g-factors re…
Tilted-Cone Induced Cusps and Nonmonotonic Structures in Dynamical Polarization Function of Massless Dirac Fermions
Tatsuro Nishine, Akito Kobayashi, Yoshikazu Suzumura
The polarization function of electrons with the tilted Dirac cone found in organic conductors is studied using the tilted Weyl equation. The dynamical property is explored based on…
Tilted-Cone-induced easy-plane pseudo-spin ferromagnet and Kosterlitz-Thouless transition in massless Dirac fermions
Akito Kobayashi, Yoshikazu Suzumura, Hidetoshi Fukuyama +1
The possible quantum Hall ferromagnet at a filling factor is investigated for the zero-energy (N=0) Landau level of the two dimensional massless Dirac fermions in -(BEDT-T…