146 citations · 273 across the 10 of their papers we have counts for
10 papers
Ultrafast electron-electron scattering in metallic phase of 2H-NbSe probed by high harmonic generation
K. S. Takeda, K. Uchida, K. Nagai +2
Electron-electron scattering on the order of a few to tens of femtoseconds plays a crucial role in the ultrafast electron dynamics of conventional metals. When mid-infrared light i…
Efficient Control of High Harmonic Generation in Carbon Nanotubes using the Aharonov-Bohm Effect
Yuta Murakami, Kohei Nagai, Akihisa Koga
We show that high-harmonic generation (HHG) in carbon nanotubes (CNTs) can be efficiently controlled using the Aharanov-Bohm (AB) effect. When a static magnetic field (B) is applie…
High-harmonic generation in the Rice-Mele model: Role of intraband current originating from interband transition
Kohei Nagai, Yuta Murakami, Akihisa Koga
We consider high-harmonic generation (HHG) in the Rice-Mele model to study the role of the intraband current originating from the change of the intraband dipole via interband trans…
Exciton-coherence generation through diabatic and adiabatic dynamics of Floquet state
Kento Uchida, Satoshi Kusaba, Kohei Nagai +2
Floquet engineering of electronic systems is a promising way of controlling quantum material properties on an ultrafast time scale. So far, the energy structure of Floquet states i…
Effect of incoherent electron-hole pairs on high harmonic generation in an atomically thin semiconductor
Kohei Nagai, Kento Uchida, Satoshi Kusaba +3
High harmonic generation (HHG) in solids reflects the underlying nonperturbative nonlinear dynamics of electrons in a strong light field and is a powerful tool for ultrafast spectr…
Visualization of two-dimensional transition dipole moment texture in momentum space using high-harmonic generation spectroscopy
K. Uchida, V. Pareek, K. Nagai +2
Highly nonlinear optical phenomena can provide access to properties of electronic systems which are otherwise difficult to access through conventional linear optical spectroscopies…
Control of high-harmonic generation by tuning the electronic structure and carrier injection
Hiroyuki Nishidome, Kohei Nagai, Kento Uchida +4
High-harmonic generation (HHG), which is generation of multiple optical harmonic light, is an unconventional nonlinear optical phenomenon beyond perturbation regime. HHG, which was…
Dynamical symmetry of strongly light-driven electronic system in crystalline solids
Kohei Nagai, Kento Uchida, Naotaka Yoshikawa +3
The Floquet state, which is a periodically and intensely light driven quantum state in solids, has been attracting attention as a novel state that is coherently controllable on an…
Inherent Limit to Coherent Phonon Generation under Non-Resonant Light Field Driving
Kento Uchida, Kohei Nagai, Naotaka Yoshikawa +1
Coherent manipulation of quasi-particles is a crucial method to realize ultrafast switching of the relating macroscopic order. In this letter, we studied coherent phonon generation…
Interband resonant high-harmonic generation by valley polarized electron-hole pairs
Naotaka Yoshikawa, Kohei Nagai, Kento Uchida +4
We demonstrated nonperturbative high harmonics induced by intense mid-infrared light up to 18th order that well exceed the material bandgap in monolayer transition metal dichalcoge…