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Floquet topological superconductivity induced by chiral many-body interactions
Sota Kitamura, Hideo Aoki
We study how a -wave superconductivity is changed when illuminated by circularly-polarised light (CPL) in the repulsive Hubbard model in the strong-coupling regime. We adopt the…
Momentum-dependent relaxation dynamics of the doped repulsive Hubbard model
Sharareh Sayyad, Naoto Tsuji, Abolhassan Vaezi +3
We study the dynamical behavior of doped electronic systems subject to a global ramp of the repulsive Hubbard interaction. We start with formulating a real-time generalization of t…
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…
Interaction quench in the Holstein model: Thermalization crossover from electron- to phonon-dominated relaxation
Yuta Murakami, Philipp Werner, Naoto Tsuji +1
We study the relaxation of the Holstein model after a sudden switch-on of the interaction by means of the nonequilibrium dynamical mean field theory, with the self-consistent Migda…
Supersolid Phase Accompanied by a Quantum Critical Point in the Intermediate Coupling Regime of the Holstein Model
Yuta Murakami, Philipp Werner, Naoto Tsuji +1
We reveal that electron-phonon systems described by the Holstein model on a bipartite lattice exhibit, away from half filling, a supersolid (SS) phase characterized by coexisting c…
Dynamical mean-field analysis of ordered phases in the half-filled Holstein-Hubbard model
Yuta Murakami, Philipp Werner, Naoto Tsuji +1
We investigate ordered phases (s-wave superconducting (SC), antiferromagnetic (AF) and charge ordered (CO) phases) of the half-filled Holstein-Hubbard model using the dynamical mea…
Nonequilibrium dynamical mean-field theory and its applications
Hideo Aoki, Naoto Tsuji, Martin Eckstein +3
The study of nonequilibrium phenomena in correlated lattice systems has developed into an active and exciting branch of condensed matter physics. This research field provides rich…
Phase diagram and pair Tomonaga-Luttinger liquid in a Bose-Hubbard model with flat bands
Shintaro Takayoshi, Hosho Katsura, Noriaki Watanabe +1
To explore superfluidity in flat-band systems, we consider a Bose-Hubbard model on a cross-linked ladder with flux, which has a flat band with a gap between the other band for…
Nonequilibrium dynamical cluster theory
Naoto Tsuji, Peter Barmettler, Hideo Aoki +1
We study the effect of spatially nonlocal correlations on the nonequilibrium dynamics of interacting fermions by constructing the nonequilibrium dynamical cluster theory, a cluster…
Ordered phases in the Holstein-Hubbard model: Interplay of strong Coulomb interaction and electron-phonon coupling
Yuta Murakami, Philipp Werner, Naoto Tsuji +1
We study the Holstein-Hubbard model at half filling to explore ordered phases including su- perconductivity (SC), antiferromagnetism (AF), and charge order (CO) in situations where…
Supersolid states in a spin system-phase diagram and collective excitations
Yuta Murakami, Takashi Oka, Hideo Aoki
Phases analogous to supersolids can be realized in spin systems. Here we obtain the phase diagram of a frustrated dimer spin-1/2 system on a square lattice and study the collective…
Magnetization and phase transition induced by circularly polarized laser in quantum magnets
Shintaro Takayoshi, Hideo Aoki, Takashi Oka
We theoretically predict a nonequilibrium phase transition in quantum spin systems induced by a laser, which provides a purely quantum-mechanical way of coherently controlling magn…
Repulsion-to-attraction transition in correlated electron systems triggered by a monocycle pulse
Naoto Tsuji, Takashi Oka, Hideo Aoki +1
We study the time evolution of the Hubbard model driven by a half-cycle or monocycle pulsed electric field F(t) using the nonequilibrium dynamical mean-field theory. We find that f…
Spin Hall effect in iron-based superconductors: A Dirac-point effect
Sudhakar Pandey, Hiroshi Kontani, Dai S. Hirashima +2
We have theoretically explored the intrinsic spin Hall effect (SHE) in the iron-based superconductor family with a variety of materials. The study is motivated by an observation th…
Non-equilibrium superconductivity in a correlated electron system studied with the Keldysh+FLEX approach
Takashi Oka, Hideo Aoki
Non-equilibrium phase transitions are studied theoretically for the two-dimensional Hubbard model subject to bias voltages from the electrodes coupled to the system. By combining t…
Nonequilibrium magnetic and superconducting phases in the two-dimensional Hubbard model coupled to electrodes
Takashi Oka, Hideo Aoki
A theory is presented for a nonequilibrium phase transition in the two-dimensional Hubbard model coupled to electrodes. Nonequilibrium magnetic and superconducting phase diagram is…
Nonequilibrium Steady State of Photoexcited Correlated Electrons in the Presence of Dissipation
Naoto Tsuji, Takashi Oka, Hideo Aoki
We present a framework to determine nonequilibrium steady states in strongly correlated electron systems in the presence of dissipation. This is demonstrated for a correlated elect…
Photo-induced Tomonaga-Luttinger-like liquid in a Mott insulator
Takashi Oka, Hideo Aoki
Photo-induced metallic states in a Mott insulator are studied for the half-filled, one-dimensional Hubbard model with the time-dependent density matrix renormalization group. An ir…
Correlated electron systems periodically driven out of equilibrium: Floquet + DMFT formalism
Naoto Tsuji, Takashi Oka, Hideo Aoki
We propose to combine the Floquet formalism for systems in ac fields with the dynamical mean-field theory to study correlated electron systems periodically driven out of equilibriu…
Nonequilibrium Quantum Breakdown in a Strongly Correlated Electron System
Takashi Oka, Hideo Aoki
The nonlinear transport properties of the Mott insulator are discussed with focus on the many-body Landau-Zener mechanism. After reviewing basic concepts such as the non-adiabatic…
Phase diagram for the one-dimensional Hubbard-Holstein model: A density-matrix renormalization group study
Masaki Tezuka, Ryotaro Arita, Hideo Aoki
Phase diagram of the Hubbard-Holstein model in the coexistence of electron-electron and electron-phonon interactions has been theoretically obtained with the density-matrix renorma…
Itinerant ferromagnetism in the multiorbital Hubbard model: a dynamical mean-field study
Shiro Sakai, Ryotaro Arita, Hideo Aoki
In order to resolve the long-standing issue of how the itinerant ferromagnetism is affected by the lattice structure and Hund's coupling, we have compared various three-dimensional…
Quantum Monte Carlo study for multiorbital systems with preserved spin and orbital rotational symmetries
Shiro Sakai, Ryotaro Arita, Karsten Held +1
We propose to combine the Trotter decomposition and a series expansion of the partition function for Hund's exchange coupling in a quantum Monte Carlo (QMC) algorithm for multiorbi…
Density-matrix renormalization group study of pairing when electron-electron and electron-phonon interactions coexist: effect of the electronic band structure
Masaki Tezuka, Ryotaro Arita, Hideo Aoki
Density-matrix renormalization group is used to study the pairing when both of electron-electron and electron-phonon interactions are strong in the Holstein-Hubbard model at half-f…