73 citations · 1.1k across the 69 of their papers we have counts for
59 papers · 1 filter
Photoinduced Pseudospin Polarization in a Three-Orbital Hubbard Model
Kenji Yonemitsu
In a Hubbard model for the Kitaev spin-liquid candidate material -RuCl with three orbitals per Ru site, we calculate photoinduced dynamics based on the exact diagon…
Light-induced magnetization driven by interorbital charge motion in a spin-orbit assisted Mott insulator alpha-RuCl3
T. Amano, Y. Kawakami, H. Itoh +12
In a honeycomb-lattice spin-orbit assisted Mott insulator α-RuCl3, an ultrafast magnetization is induced by circularly polarized excitation below the Mott gap. Photo-carriers play…
Polarization-dependent magnetic properties of periodically driven -RuCl
Naoya Arakawa, Kenji Yonemitsu
We study magnetic properties of a periodically driven Mott insulator with strong spin-orbit coupling and show some properties characteristic of linearly polarized light. We conside…
Floquet engineering of Mott insulators with strong spin-orbit coupling
Naoya Arakawa, Kenji Yonemitsu
We propose a method for controlling the exchange interactions of Mott insulators with strong spin-orbit coupling. We consider a multiorbital system with strong spin-orbit coupling…
Mechanism for Synchronization of Charge Oscillations in Dimer Lattices
Kenji Yonemitsu, Philipp Werner
We discuss the mechanism and the conditions for the appearance of synchronized charge oscillations which have been observed experimentally and theoretically after strong photoexcit…
Photoinduced dynamics of excitonic order and Rabi oscillation in the two-orbital Hubbard model
Yasuhiro Tanaka, Kenji Yonemitsu
We investigate the condition for the photoinduced enhancement of an excitonic order in a two-orbital Hubbard model, which has been theoretically proposed in our previous work [Phys…
Competition between Interactions and Randomness in Photoinduced Synchronization of Charge Oscillations on a Dimer Lattice
Toshiya Shimada, Kenji Yonemitsu
The synchronization of charge oscillations after photoexcitation that has been realized through the emergence of an electronic breathing mode on dimer lattices is studied here from…
Photoinduced Dynamics of Commensurate Charge Density Wave in 1T-TaS Based on Three-Orbital Hubbard Model
Tatsuhiko N. Ikeda, Hirokazu Tsunetsugu, Kenji Yonemitsu
We study the coupled charge-lattice dynamics in the commensurate charge density wave (CDW) phase of the layered compound 1T-TaS driven by an ultrashort laser pulse. For descr…
Strong light-field effects driven by nearly single-cycle 7-fs light field in correlated organic conductors
Yohei Kawakami, Hirotake Itoh, Kenji Yonemitsu +1
We have demonstrated transient charge localization effects with a driving high-frequency field of 7-fs, 1.5-cycle near infrared light in correlated organic conductors. In a layered…
Non-linear charge oscillation driven by a single-cycle light-field in an organic superconductor
Y. Kawakami, T. Amano, Y. Yoneyama +11
Intense light-field application to solids produces enormous/ultrafast non-linear phenomena such as high-harmonic generations 1, 2 and attosecond charge dynamics 3, 4. They are dist…
Photoinduced High-Frequency Charge Oscillations in Dimerized Systems
Kenji Yonemitsu
Photoinduced charge dynamics in dimerized systems is studied on the basis of the exact diagonalization method and the time-dependent Schrödinger equation for a one-dimensional spin…
Photoinduced enhancement of excitonic order in the two-orbital Hubbard model
Yasuhiro Tanaka, Manabu Daira, Kenji Yonemitsu
Photoinduced dynamics in an excitonic insulator is studied theoretically by using a two-orbital Hubbard model on the square lattice where the excitonic phase in the ground state is…
High-Frequency Analysis of Effective Interactions and Bandwidth for Transient States after Monocycle Pulse Excitation of Extended Hubbard Model
Kenji Yonemitsu
Using a high-frequency expansion in periodically driven extended Hubbard models, where the strengths and ranges of density-density interactions are arbitrary, we obtain the effecti…
Photoinduced Enhancement of Anisotropic Charge Correlations on Triangular Lattices with Trimers
Kenji Yonemitsu
To explore nontrivial photoinduced modulations of charge correlations, we theoretically study photoinduced dynamics in quarter-filled extended Hubbard models with competing intersi…
Ultrafast response of plasma-like reflectivity edge in (TMTTF)2AsF6 driven by 7-fs, 1.5-cycle strong-light field
Y. Naitoh, Y. Kawakami, T. Ishikawa +9
The strong light-field effect of (TMTTF)2AsF6 was investigated utilizing 1.5-cycle, 7-fs infrared pulses. The ultarfast (20 fs) and large (40%) response of the plasma-like reflecti…
Phase Separation Induced by Symmetric Monocycle Optical Pulse in Extended Hubbard Models
Hiroki Yanagiya, Yasuhiro Tanaka, Kenji Yonemitsu
Many-electron dynamics induced by a symmetric monocycle electric-field pulse of large amplitude is theoretically investigated in one- and two-dimensional half-filled extended Hubba…
Optical freezing of charge motion in an organic conductor
Takahiro Ishikawa, Yuto Sagae, Yota Naitoh +10
Dynamical localization, i.e., reduction of the intersite electronic transfer integral t by an alternating electric field, E(omega) , is a promising strategy for controlling strongl…
Negative-Temperature State Formed and Interactions Inverted by Symmetric Monocycle Optical Pulse Excitation
Kenji Yonemitsu, Keita Nishioka
The excited state dynamics of correlated electron and electron-phonon systems triggered by an oscillating electric-field pulse of large amplitude are theoretically investigated. A…
Roles of Potential Gradient and Electrode Bandwidth on Negative Differential Resistance in One-Dimensional Band Insulator
Yasuhiro Tanaka, Kenji Yonemitsu
A negative differential resistance (NDR) in a one-dimensional band insulator attached to electrodes is investigated. We systematically examine the effects of an electrode bandwidth…
Charge order and possible bias-induced metastable state in the organic conductor β-(meso-DMBEDT-TTF)2PF6: effects of structural distortion
Yasuhiro Tanaka, Kenji Yonemitsu
We theoretically investigate charge order and nonlinear conduction in a quasi-two-dimensional organic conductor β-(meso-DMBEDT-TTF)2PF6 [DMBEDT-TTF=dimethylbis(ethylenedithio)tetra…
Nonlinear Conduction by Melting of Stripe-Type Charge Order in Organic Conductors with Triangular Lattices
Yasuhiro Tanaka, Kenji Yonemitsu
We theoretically discuss the mechanism for the peculiar nonlinear conduction in quasi-two-dimensional organic conductors θ-(BEDT-TTF)2X [BEDT-TTF=bis(ethylenedithio)tetrathiafulval…
Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal
Kenji Yonemitsu, Satoshi Miyashita, Nobuya Maeshima
We theoretically study pump-photon-energy-dependent pathways of a photoinduced dimer-Mott-insulator-to-metal transition, on the basis of numerical solutions to the time-dependent S…
Effects of Lattice and Molecular Phonons on Photoinduced Neutral-to-Ionic Transition Dynamics in Tetrathiafulvalene--Chloranil
Kenji Yonemitsu
For electronic states and photoinduced charge dynamics near the neutral-ionic transition in the mixed-stack charge-transfer complex tetrathiafulvalene--chloranil (TTF-CA), we re…
Crossover from bias-induced to field-induced breakdowns in one-dimensional band and Mott insulators attached to electrodes
Yasuhiro Tanaka, Kenji Yonemitsu
Nonequilibrium states induced by an applied bias voltage (V) and the corresponding current-voltage characteristics of one-dimensional models describing band and Mott insulators are…