Half-Skyrmion theory for high-temperature superconductivity (2009)
We review the half-Skyrmion theory for copper-oxide high-temperature superconductivity. In the theory, doped holes create a half-Skyrmion spin texture which is characterized by a topological charge....
Morinari, Takao, Nakamura, Hiroki, Machida, Masahiko, Tohyama, Takami
In layered single band systems, the interlayer conductivity depends on the orientation of the in-plane magnetic field and takes maximum values when the magnetic field is perpendicular to flat regions...
Induced Order in Nonequivalent Two-Leg Hubbard Ladder (2009)
Yoshizumi, Hiroyuki, Tohyama, Takami, Morinari, Takao
Motivated by the presence of different orders in multilayered high-temperature superconductors, we examine a model consisting of nonequivalent two Hubbard chains coupled by interchain hopping by...
Morinari, Takao, Himura, Takahiro, Tohyama, Takami
It is proposed that the presence of a tilted and anisotropic Dirac cone can be verified using the interlayer magnetoresistance in the layered Dirac fermion system, which is realized in...
Spacetime analogue of Bose-Einstein condensates: Bogoliubov-de Gennes formulation (2008)
Kurita, Yasunari, Kobayashi, Michikazu, Morinari, Takao, Tsubota, Makoto, Ishihara, Hideki
We construct quantum field theory in an analogue curved spacetime in Bose-Einstein condensates based on the Bogoliubov-de Gennes equations, by exactly relating quantum particles in curved spacetime...
Motivated by recent quantum oscillation observations in the underdoped high-temperature superconductors, the effect of the short-range antiferromagnetic correlations on the electronic properties of...
Formation of a sonic horizon in isotropically expanding Bose-Einstein condensates (2007)
Kurita, Yasunari, Morinari, Takao
We propose a simple experiment to create a sonic horizon in isotropically trapped cold atoms within currently available experimental techniques. Numerical simulation of the Gross-Pitaevskii equation...
Half-skyrmion picture of single hole doped high-T_c cuprate (2005)
The single hole doped CuO_2 plane is studied by the O(3) non-linear \sigma model and its CP^1 representation. It is argued that the spin configuration around a Zhang-Rice singlet is described by a...
Evolution of Neel order and localized spin moment in the doped two-dimensional Hubbard model (2002)
We investigate effects of doped holes' hopping on Neel order in the two-dimensional Hubbard model. Semiclassical staggered moments are computed by solving saddle point equations derived from a...
Sachdev, Subir, Morinari, Takao
We describe two dimensional models with a metallic Fermi surface which display quantum phase transitions controlled by strongly interacting critical field theories below their upper critical...
Reexamination of d-wave superconductivity in the two-dimensional Hubbard model (2002)
We reexamine the possibility of d-wave superconductivity in the hole-doped two-dimensional Hubbard model. In terms of the gauge field description of the spin fluctuations, we show that d-wave...
Tunneling effect on composite fermion pairing state in bilayer quantum Hall system (2001)
We discuss the composite fermion pairing state in bilayer quantum Hall systems. After the evaluation of the range of the inter-layer separation in which the quantum Hall state is stabilized, we...
We propose a mechanism of unconventional superconductivity in two-dimensional strongly-correlated electron systems. We consider a two-dimensional Kondo lattice system or double-exchange system with...
d-Wave Superconductivity Induced by Chern-Simons Term in High-$T_c$ Cuprates (2000)
We show that a Chern-Simons term for a gauge field describing a fluctuation of spins is induced by integrating out hole fields in the presence of spin-orbit coupling which originates from a buckling...
The influence of chiral surface states on the London penetration depth in Sr$_2$RuO$_4$ (2000)
Morinari, Takao, Sigrist, Manfred
The London penetration depth for the unconventional superconductor Sr$_2$RuO$_4$ is analyzed assuming an order parameter which breaks time reversal symmetry and parity simultaneously. Such a...
The role of imaginary vector potential in composite fermion pairing theory (1999)
We show that the imaginary vector potential causes a pair-breaking effect in the composite fermion theory, and discuss its irrelevance in the pairing state. The Hamiltonian for pairing states of...
Quantum Hall effect at half-filled Landau level: Pairing of composite fermions (1998)
We discuss the possibility of the quantum Hall effect at half-filled Landau level in terms of the pairing of the composite fermions. In the absence of Coulomb energy, we show that the ground state of...
Composite Fermion Pairing in Bilayer Quantum Hall Systems (1998)
We derive the effective Hamiltonian for the composite fermion in double-layer quantum Hall systems with inter-layer tunneling at total Landau-level filling factor $\nu=1/m$, where $m$ is an integer....
Edge Modes in the Hierarchical Fractional Quantum Hall Liquids with Coulomb Interaction (1996)
Morinari, Takao, Nagaosa, Naoto
Edge modes are studied for the hierarchical fractional quantum Hall liquids (FQHL) by treating the edge and bulk in a unified fashion. Within the RPA treatment of the composite boson effective theory...