138 citations · 320 across the 5 of their papers we have counts for
5 papers
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…
Spin excitations in the quasi-two-dimensional charge-ordered insulator -(BEDT-TTF)I probed via C NMR
Kyohei Ishikawa, Michihiro Hirata, Dong Liu +3
The spin excitations from the nonmagnetic charge-ordered insulating state of -(BEDT-TTF)I at ambient pressure have been investigated by probing the static and low-freque…
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…
Insulating nature of strongly correlated massless Dirac fermions in an organic crystal
Dong Liu, Kyohei Ishikawa, Ryosuke Takehara +3
Through resistivity measurements of an organic crystal hosting massless Dirac fermions with a charge-ordering instability, we reveal the effect of interactions among Dirac fermions…
C NMR Study on the Charge-Disproportionated Conducting State in the Quasi-Two-Dimensional Organic Conductor -(BEDT-TTF)I
Michihiro Hirata, Kyohei Ishikawa, Kazuya Miyagawa +1
The conducting state of the quasi-two-dimensional organic conductor, -(BEDT-TTF)I, at ambient pressure is investigated with C NMR measurements, which separate the…