8 citations · 25 across the 10 of their papers we have counts for
10 papers
Multi-Triplon Excitations of Hubbard Ladders with Site-Dependent Potentials
Nobuya Maeshima, Ken-ichi Hino
We study low-lying spin-singlet excitations of two-leg Hubbard ladders with site-dependent potentials. Using general formulas of the charge disproportionation induced by the site-d…
Laser induced surface magnetization in Floquet-Weyl semimetals
Runnan Zhang, Ken-ichi Hino, Nobuya Maeshima +2
We investigate optically induced magnetization in Floquet-Weyl semimetals generated by irradiation of a circularly-polarized continuous-wave laser from the group II-V narrow gap se…
Floquet-Weyl semimetals generated by an optically resonant interband-transition
Runnan Zhang, Ken-ichi Hino, Nobuya Maeshima
Floquet-Weyl semimetals (FWSMs) generated by irradiation of a continuous-wave laser with left-hand circular polarization (rotating in counterclockwise sense with time) on the group…
Edge states of Floquet-Dirac semimetal in a laser-driven semiconductor quantum-well
Boyuan Zhang, Nobuya Maeshima, Ken-ichi Hino
Band crossings observed in a wide range of condensed matter systems are recognized as a key to understand low-energy fermionic excitations that behave as massless Dirac particles.…
Dynamical Charge Structure Factor of a One-Dimensional Ionic Hubbard Model in the Low-Energy Region
Yuhei Komaki, Yuma Iwase, Shogo Yanagimatsu +3
We present a numerical study of the charge dynamical structure factor N(k,omega) of a one-dimensional (1D) ionic Hubbard model in the Mott insulator phase. We show that the low-ene…
Ultrafast asymmetric Rosen-Zener-like coherent phonon responses observed in silicon
Yohei Watanabe, Ken-ichi Hino, Nobuya Maeshima +2
We investigate the spectral profiles of time signals attributed to coherent phonon generation in an undoped Si crystal. Here, the retarded longitudinal-optical (LO) phonon Green fu…
Irregular Oscillatory-Patterns in the Early-Time Region of Coherent Phonon Generation in Silicon
Yohei Watanabe, Ken-ichi Hino, Muneaki Hase +1
Coherent phonon (CP) generation in an undoped Si crystal is theoretically investigated to shed light on unexplored quantum-mechanical effects in the early-time region immediately a…
Manifestation of anomalous Floquet states with longevity in dynamic fractional Stark ladder with high AC electric fields
Yuya Nemoto, Fumitaka Ohno, Nobuya Maeshima +1
We examine a resonance structure of Floquet state in dynamic fractional Stark ladder (DFSL) realized in biased semiconductor superlattices driven by a terahertz cw laser on the bas…
Polaronic-Quasiparticle Picture for Generation Dynamics of Coherent Phonons in Semiconductors: Transient and Non-Linear Fano Resonance
Yohei Watanabe, Ken-ichi Hino, Muneaki Hase +1
We examine generation dynamics of coherent phonons (CPs) in both of polar and non-polar semiconductors -- such as GaAs and Si -- based on a polaronic-quasiparticle (PQ) model. In t…
Photoinduced coherent oscillations in the one-dimensional two-orbital Hubbard model
Nobuya Maeshima, Ken-ichi Hino, Kenji Yonemitsu
We study photoinduced ultrafast coherent oscillations originating from orbital degrees of freedom in the one-dimensional two-orbital Hubbard model. By solving the time-dependent Sc…