589 citations · 1k across the 21 of their papers we have counts for
22 papers
Exotic vortex states and enhancement of orbital upper critical fields in an -wave quasicrystalline superconductor
Takumi Fukushima, Yuki Yamamoto, Nayuta Takemori +3
Quasicrystals possess long-range order without translational symmetry, giving rise to intrinsically inhomogeneous superconducting states. Using the Bogoliubov-de Gennes mean-field…
Generalized Bloch-like ground states in distinct electron-site configurations derived from the same quasiperiodic structure
Yuki Yamamoto, Nayuta Takemori
Sutherland-Kalugin-Katz (SKK) states have been proposed as generalized Bloch-like states in quasiperiodic systems where the absence of translational symmetry prevents the applicati…
Ab initio extended Hubbard model of short polyenes for efficient quantum computing
Yuichiro Yoshida, Nayuta Takemori, Wataru Mizukami
We propose introducing an extended Hubbard Hamiltonian derived via the ab initio downfolding method, which was originally formulated for periodic materials, towards efficient quant…
Balancing error budget for fermionic k-RDM estimation
Nayuta Takemori, Yusuke Teranishi, Wataru Mizukami +1
The reduced density matrix (RDM) is crucial in quantum many-body systems for understanding physical properties, including all local physical quantity information. This study aims t…
Anomalously large spin-dependent electron correlation in nearly half-metallic ferromagnet CoS
Hirokazu Fujiwara, Kensei Terashima, Junya Otsuki +19
The spin-dependent band structure of CoS which is a candidate for a half-metallic ferromagnet was investigated by both spin- and angle-resolved photoemission spectroscopy and t…
Supercurrent Distribution in Real-Space and Anomalous Paramagnetic Response in a Superconducting Quasicrystal
Takumi Fukushima, Nayuta Takemori, Shiro Sakai +2
We theoretically study the real-space distribution of the supercurrent that flows under a uniform vector potential in a two-dimensional quasiperiodic structure. This is done by con…
A comprehensive survey on quantum computer usage: How many qubits are employed for what purposes?
Tsubasa Ichikawa, Hideaki Hakoshima, Koji Inui +18
Quantum computers (QCs), which work based on the law of quantum mechanics, are expected to be faster than classical computers in several computational tasks such as prime factoring…
Doped Mott insulator on Penrose tiling
Shiro Sakai, Nayuta Takemori
We study the effect of carrier doping to the Mott insulator on the Penrose tiling, aiming at clarifying the interplay between quasiperiodicity and strong electron correlations. We…
DCore: Integrated DMFT software for correlated electrons
Hiroshi Shinaoka, Junya Otsuki, Mitsuaki Kawamura +2
We present a new open-source program, DCore, that implements dynamical mean-field theory (DMFT). DCore features a user-friendly interface based on text and HDF5 files. It allows DM…
Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
Makoto Shimizu, Nayuta Takemori, Daniel Guterding +1
The van-der-Waals gap of iron chalcogenide superconductors can be intercalated with a variety of inorganic and organic compounds that modify the electron doping level of the iron l…
Physical properties of weak-coupling quasiperiodic superconductors
Nayuta Takemori, Ryotaro Arita, Shiro Sakai
We numerically study the physical properties of quasiperiodic superconductors with the aim of understanding superconductivity in quasicrystals. Considering the attractive Hubbard m…
The Hubbard model on the honeycomb lattice: from static and dynamical mean-field theories to lattice quantum Monte Carlo simulations
Marcin Raczkowski, Robert Peters, Th\d{i} Thu Phùng +4
We study the one-band Hubbard model on the honeycomb lattice using a combination of quantum Monte Carlo (QMC) simulations and static as well as dynamical mean-field theory (DMFT).…
Novel Fe-based superconductor LaFe2As2 in comparison with traditional pnictides
I. I. Mazin, Makoto Shimizu, Nayuta Takemori +1
The recently discovered Fe-based superconductor (FeBS) LaFe2As2 seems to break away from an established pattern that doping FeBS beyond 0.2e/Fe destroys superconductivity. LaFe2As2…
Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
Akito Sakai, Yo Pierre Mizuta, Agustinus Agung Nugroho +9
In metallic ferromagnets, the Berry curvature of underlying quasiparticles can cause an electric voltage perpendicular to both magnetization and an applied temperature gradient, a…
Two-dome superconductivity in FeS induced by a Lifshitz transition
Makoto Shimizu, Nayuta Takemori, Daniel Guterding +1
Among iron chalcogenide superconductors, FeS can be viewed as a simple, highly compressed relative of FeSe without nematic phase and with weaker electronic correlations. Under pres…
Intersite electron correlations on inhomogeneous lattices: a real-space dual fermion approach
Nayuta Takemori, Akihisa Koga, Hartmut Hafermann
We develop a real-space extension of the dual fermion approach. This method is formulated in terms of real-space Green's functions and local vertex functions, which enables us to d…
Superconductivity on a Quasiperiodic Lattice: Extended-to-Localized Crossover of Cooper Pairs
Shiro Sakai, Nayuta Takemori, Akihisa Koga +1
We study a possible superconductivity in quasiperiodic systems, by portraying the issue within the attractive Hubbard model on a Penrose lattice. Applying a real-space dynamical me…
Intersite electron correlations in a Hubbard model on inhomogeneous lattices
Nayuta Takemori, Akihisa Koga, Hartmut Hafermann
We study intersite electron correlations in the half-filled Hubbard model on square lattices with periodic and open boundary conditions by means of a real-space dual fermion approa…
Valence Fluctuations and Electric Reconstruction in the Extended Anderson Model on the Two-Dimensional Penrose Lattice
Shinichi Takemura, Nayuta Takemori, Akihisa Koga
We study the extended Anderson model on the two-dimensional Penrose lattice, combining the real-space dynamical mean-field theory with the non-crossing approximation. It is found t…
Local Electron Correlations in a Two-dimensional Hubbard Model on the Penrose Lattice
Nayuta Takemori, Akihisa Koga
We study electron correlations in the half-filled Hubbard model on two-dimensional Penrose lattice. Applying the real-space dynamical mean-field theory to large clusters, we discus…
Stability of the Superfluid State in Three-Component Fermionic Optical Lattice Systems
Yuki Okanami, Nayuta Takemori, Akihisa Koga
Three-component fermionic optical lattice systems are investigated in dynamical mean-field theory for the Hubbard model. Solving the effective impurity model by means of continuous…
Low temperature properties of the fermionic mixtures with mass imbalance in optical lattice
Nayuta Takemori, Akihisa Koga
We study the attractive Hubbard model with mass imbalance to clarify low temperature properties of the fermionic mixtures in the optical lattice. By combining dynamical mean-field…