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Superconductivity assisted by inter-layer pair hopping in multi-layered cuprates
Kazutaka Nishiguchi, Kazuhiko Kuroki, Ryotaro Arita +2
In order to explore why the multi-layered cuprates have such high Tc's, we have examined various inter-layer processes. Since the inter-layer one-electron hopping has little effect…
Three-orbital study on the orbital distillation effect in the high Tc cuprates
H. Sakakibara, K. Suzuki, H. Usui +4
Our recent study has revealed that the mixture of the dz2 orbital component into the Fermi surface suppresses Tc in the cuprates such as La2CuO4. We have also shown that applying h…
First-principles band structure and FLEX approach to the pressure effect on of the cuprate superconductors
Hirofumi Sakakibara, Katsuhiro Suzuki, Hidetomo Usui +4
High-temperature cuprate superconductors have been known to exhibit significant pressure effects. In order to fathom the origin of why and how Tc is affected by pressure, we have r…
Chiral Symmetry and Many-Body Effect in Multilayer Graphene
Yuji Hamamoto, Tohru Kawarabayashi, Hideo Aoki +1
Influence of the chiral symmetry on the many-body problem in multilayer graphene in magnetic fields is investigated. For a spinless electron model on the honeycomb lattice the many…
Investigation on synthesis and physical properties of metal doped picene solids
Takashi Kambe, Xuexia He, Yosuke Takahashi +13
We report electronic structure and physical properties of metal doped picene as well as selective synthesis of the phase exhibiting 18 K superconducting transition. First, Raman sc…
Stability of zero-mode Landau levels in bilayer graphene against disorder in the presence of the trigonal warping
Tohru Kawarabayashi, Yasuhiro Hatsugai, Hideo Aoki
The stability of the zero-energy Landau levels in bilayer graphene against the chiral symmetric disorder is examined in the presence of the trigonal warping. Based on the tight-bin…
Chiral symmetry and fermion doubling in the zero-mode Landau levels of massless Dirac fermions with disorder
T. Kawarabayashi, T. Honda, H. Aoki +1
The effect of disorder on the Landau levels of massless Dirac fermions is examined for the cases with and without the fermion doubling. To tune the doubling a tight-binding model h…
Chiral condensate with topological degeneracy in graphene and its manifestation in edge states
Yuji Hamamoto, Hideo Aoki, Yasuhiro Hatsugai
Role of chiral symmetry in many-body states of graphene in strong magnetic fields is theoretically studied with the honeycomb lattice model. For a spin-split Landau level where the…
Faraday rotation in bilayer and trilayer graphene in the quantum Hall regime
Takahiro Morimoto, Mikito Koshino, Hideo Aoki
Optical Hall conductivity, as directly related to Faraday rotation, is theoretically studied for bilayer and trilayer graphene. In bilayer graphene, the trigonal warping of the ban…
Magneto-orbital effect without spin-orbit interactions --- noncentrosymmetric zeolite-templated carbon structure
Takashi Koretsune, Ryotaro Arita, Hideo Aoki
A peculiar manifestation of orbital angular momentum is proposed for a zeolite-templated carbon system, C36H9. The structure, being a network of nanoflakes in the shape of a "pinwh…
Accessing surface Brillouin zone and band structure of picene single crystals
Qian Xin, Steffen Duhm, Fabio Bussolotti +6
We have experimentally revealed the band structure and the surface Brillouin zone of insulating picene single crystals (SCs), the mother organic system for a recently discovered ar…
Multiorbital analysis of the effects of uniaxial and hydrostatic pressure on in the single-layered cuprate superconductors
Hirofumi Sakakibara, Katsuhiro Suzuki, Hidetomo Usui +4
The origin of uniaxial and hydrostatic pressure effects on in the single-layered cuprate superconductors is theoretically explored. A two-orbital model, derived from first pr…
A perspective of superconductivity as multiband phenomena: Cuprate, iron and aromatic systems
Hideo Aoki
A theoretical overview of the classes of superconductors encompassing (a) high-Tc cuprate, (b) iron-based and (c) aromatic superconductors is given. Emphasis is put on the multiban…
Generalization of Chiral Symmetry for Tilted Dirac Cones
Tohru Kawarabayashi, Yasuhiro Hatsugai, Takahiro Morimoto +1
The notion of chiral symmetry for the conventional Dirac cone is generalized to include the tilted Dirac cones, where the generalized chiral operator turns out to be non-hermitian.…