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Spin and charge dynamics of doped one-dimensional Mott insulators
Takami Tohyama, Hiroki Maeda, Kenji Tsutsui +2
Recent angle-resolved photoemission spectroscopy (ARPES) for a newly discovered doped one-dimensional (1D) Mott insulator BaSrCuO proposed the presence of attra…
Kekulé valence bond order in the Hubbard model on the honeycomb lattice with possible lattice distortions for graphene
Yuichi Otsuka, Seiji Yunoki
We investigate if and how the valence-bond-solid (VBS) state emerges in the Hubbard model on the honeycomb lattice when the Peierls-type electron-lattice coupling is introduced. We…
Spin loop-current textures in Hubbard models
Kazuya Shinjo, Shigetoshi Sota, Seiji Yunoki +1
The recent experimental observations of loop current in SrIrO, YBaCuO, and SrCuO have inspired a theoretical study that broadly r…
Anomalous suppression of photo-induced in-gap weight in the optical conductivity of a two-leg Hubbard ladder
Takami Tohyama, Kazuya Shinjo, Shigetoshi Sota +1
Photoinduced nonequilibrium states in the Mott insulators reflect the fundamental nature of competition between itinerancy and localization of the charge degrees of freedom. The sp…
Controlling inversion and time-reversal symmetries by subcycle pulses in the one-dimensional extended Hubbard model
Kazuya Shinjo, Shigetoshi Sota, Seiji Yunoki +1
Owning to their high controllability, laser pulses have contributed greatly to our understanding of strongly correlated electron systems. However, typical multicycle pulses do not…
Variational counterdiabatic driving of the Hubbard model for ground-state preparation
Q Xie, Kazuhiro Seki, Seiji Yunoki
Counterdiabatic (CD) protocols enable fast driving of quantum states by invoking an auxiliary adiabatic gauge potential (AGP) that suppresses transitions to excited states througho…
Local multiplet formation around a single vacancy in graphene: an effective Anderson model analysis based on the block-Lanczos DMRG method
Tomonori Shirakawa, Seiji Yunoki
To better understand the electronic structure of a single vacancy in graphene, we study the ground state property of an effective Anderson model, consisting of three dangling $sp^2…
QMC study of the chiral Heisenberg Gross-Neveu universality class
Yuichi Otsuka, Kazuhiro Seki, Sandro Sorella +1
We investigate a quantum criticality of an antiferromagnetic phase transition in the Hubbard model on a square lattice with a -wave pairing field by large-scale auxiliary-field…
Higher-Order Topological Mott Insulator on the Pyrochlore Lattice
Yuichi Otsuka, Tsuneya Yoshida, Koji Kudo +2
We provide the first unbiased evidence for a higher-order topological Mott insulator in three dimensions by numerically exact quantum Monte Carlo simulations. This insulating phase…
Dirac electrons in the square lattice Hubbard model with a -wave pairing field: chiral Heisenberg universality class revisited
Yuichi Otsuka, Kazuhiro Seki, Sandro Sorella +1
We numerically investigate the quantum criticality of the chiral Heisenberg universality class with the total number of fermion components =8 in terms of the Gross-Neveu theory.…
Photoinduced -pairing at finite temperatures
Satoshi Ejima, Tatsuya Kaneko, Florian Lange +2
We numerically prove photoinduced -pairing in a half-filled fermionic Hubbard chain at both zero and finite temperature. The result, obtained by combining the matrix-product-sta…
Proximate Kitaev system for an intermediate magnetic phase in in-plane magnetic fields
Beom Hyun Kim, Shigetoshi Sota, Tomonori Shirakawa +2
Motivated by the magnetic phase transition of a proximate Kitaev system -RuCl in the presence of a magnetic field, we study the simplest but essential quantum spin model wit…
Photoinduced -pairing in One-dimensional Mott Insulators
Satoshi Ejima, Tatsuya Kaneko, Florian Lange +2
Employing the density-matrix renormalization group technique in the matrix-product-state representation, we investigate the photoexcited superconducting correlations induced by the…
Spin Dynamics in the t-t'-J Model: Dynamical Density-Matrix Renormalization Group Study
Takami Tohyama, Shigetoshi Sota, Seiji Yunoki
The ground state of a hole-doped t-t'-J ladder with four legs favors a striped charge distribution. Spin excitation from the striped ground state is known to exhibit incommensurate…
Photoinduced pairing in the Kondo lattice model
Tomonori Shirakawa, Shohei Miyakoshi, Seiji Yunoki
The previous theoretical study has shown that pulse irradiation to the Mott insulating state in the Hubbard model can induce the enhancement of superconducting correlation due to t…
Superconductivity and charge density wave under a time-dependent periodic field in the one-dimensional attractive Hubbard model
Ryo Fujiuchi, Tatsuya Kaneko, Koudai Sugimoto +2
We investigate the competition between superconductivity (SC) and charge density wave (CDW) under a time-dependent periodic field in the attractive Hubbard model. By employing the…
Block-Lanczos density-matrix renormalization-group approach to spin transport in Heisenberg chains coupled to leads
F. Lange, S. Ejima, T. Shirakawa +2
We adapt the block-Lanczos density-matrix renormalization-group technique to study the spin transport in a spin chain coupled to two non-interacting fermionic leads. As an example,…
Thermodynamic properties of an ring-exchange model on the triangular lattice
Kazuhiro Seki, Seiji Yunoki
By using a numerically exact diagonalization technique and a block-extended version of the finite-temperature Lanczos method, we study thermodynamic properties of an Heisen…
Phase diagram of the two-dimensional Hubbard-Holstein model: enhancement of -wave pairing between charge and magnetic orders
Natanael C. Costa, Kazuhiro Seki, Seiji Yunoki +1
We investigate the role of electron-electron and electron-phonon interactions in strongly correlated systems by performing unbiased quantum Monte Carlo simulations in the square la…
Charge stiffness and long-range correlation in the optically induced -pairing state of the one-dimensional Hubbard model
Tatsuya Kaneko, Seiji Yunoki, Andrew J. Millis
We show that optical excitation of the Mott insulating phase of the one-dimensional Hubbard model can create a state possessing two of the hallmarks of superconductivity: a nonvani…
Non-Fermi-liquid behavior and doping asymmetry in an organic Mott insulator interface
Yoshitaka Kawasugi, Kazuhiro Seki, Jiang Pu +4
High- superconductors show anomalous transport properties in their normal states, such as the bad-metal and pseudogap behaviors. To discuss their origins, it is importan…
Photoinduced electron-electron pairing in the extended Falicov-Kimball model
Ryo Fujiuchi, Tatsuya Kaneko, Yukinori Ohta +1
By employing the time-dependent exact diagonalization method, we investigate the photoexcited states of the excitonic insulator in the extended Falicov-Kimball model (EFKM). We her…
Machine Learning Phase Diagram in the Half-filled One-dimensional Extended Hubbard Model
Kazuya Shinjo, Kakeru Sasaki, Satoru Hase +4
We demonstrate that supervised machine learning (ML) with entanglement spectrum can give useful information for constructing phase diagram in the half-filled one-dimensional extend…
Two-dimensional ground-state mapping of a Mott-Hubbard system in a flexible field-effect device
Yoshitaka Kawasugi, Kazuhiro Seki, Satoshi Tajima +5
A Mott insulator sometimes induces unconventional superconductivity in its neighbors when doped and/or pressurized. Because the phase diagram should be strongly related to the micr…