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Three-dimensional porous graphene networks expand graphene-based electronic device applications
Yoshikazu Ito, Yoichi Tanabe, Katsuaki Sugawara +5
Graphene with excellent 2D characters has been required to expand their potentials for meeting applicational demands in recent years. As one avenue, several approaches for fablicat…
Higgs mode in the d-wave superconductor Bi2Sr2CaCu2O8+x driven by an intense terahertz pulse
Kota Katsumi, Naoto Tsuji, Yuki I. Hamada +7
We investigated the terahertz (THz)-pulse driven nonlinear response in the d-wave cuprate superconductor Bi2Sr2CaCu2O8+x (Bi2212) using a THz pump near-infrared probe scheme in the…
New class of flat-band models on tetragonal and hexagonal lattices: Gapped versus crossing flat bands
Tatsuhiro Misumi, Hideo Aoki
We propose a new class of tight-binding models where a flat band is either gapped from or crossing right through a dispersive band on two-band (i.e., two sites/unit cell) tetragona…
Possible high- superconductivity due to incipient narrow bands originating from hidden ladders in Ruddlesden-Popper compounds
Daisuke Ogura, Hideo Aoki, Kazuhiko Kuroki
We introduce a concept of hidden ladders for the bilayer Ruddlesden-Popper type compounds: While the crystal structure is bilayer, () orbitals in the relevant $t_{…
Polarization-resolved terahertz third-harmonic generation in a superconductor NbN: dominance of Higgs mode beyond the BCS approximation
Ryusuke Matsunaga, Naoto Tsuji, Kazumasa Makise +3
Recent advances in time-domain terahertz (THz) spectroscopy have unveiled that resonantly-enhanced strong THz third-harmonic generation (THG) mediated by the collective Higgs ampli…
Probing and controlling spin chirality in Mott insulators by circularly polarized laser
Sota Kitamura, Takashi Oka, Hideo Aoki
Scalar spin chirality, a three-body spin correlation that breaks time-reversal symmetry, is revealed to couple directly to circularly polarized laser. This is shown by the Floquet…