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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…
Microscopic Evidence for Preformed Cooper Pairs in Pressure-Tuned Organic Superconductors near Mott Transition
Tetsuya Furukawa, Kazuya Miyagawa, Mitsunori Matsumoto +2
A weird electronic state accompanied with an anomalous superconducting precursor and/or exotic orders, called the pseudogap state, arises prior to a superconducting condensate in u…
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…
Quantum Spin Liquid States
Yi Zhou, Kazushi Kanoda, Tai-Kai Ng
This article is an introductory review of the physics of quantum spin liquid (QSL) states. Quantum magnetism is a rapidly evolving field, and recent developments reveal that the gr…
Spin-charge-entangled non-Fermi liquid in a candidate material for a doped spin liquid
H. Oike, Y. Suzuki, H. Taniguchi +2
Quantum spin liquids are exotic Mott insulators that carry extraordinary spin excitations and thus, when doped, expected to afford novel metallic states coupled to the unconvention…
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…