425 citations · 1.4k across the 31 of their papers we have counts for
32 papers
Time- and Frequency-Resolved Observation of Inverse Orbital Hall Effect in Gallium Nitride via Terahertz Polarimetry
Kota Aikyo, Tomohiro Fujimoto, Ami Mi Shirai +6
Orbitronics has attracted significant attention as a platform for information storage and processing that exploits the orbital angular momentum (OAM) of electrons without the need…
High-Field Terahertz Spin Resonance in CrO above the Spin-Flop Transition
Kaiyang Huang, Yuto Kinoshita, Natsuki Kanda +4
We report single-shot terahertz time-domain spectroscopy of CrO in pulsed magnetic fields up to 30 T. Well above the spin-flop field, in the 20-30 T range, the resonance fr…
Efficiency in a repetitive pulse magnet
Akihiko Ikeda, Yuto Ishii, Yasuhiro H. Matsuda +3
A repetitive-pulse magnet is a promising tool when combined with repetitive excitations, such as pulsed lasers. Technically, the repetition and the magnetic field values in a repet…
Large Photoelasticity in Topological Antiferromagnet MnSn Studied by Coherent Acoustic Phonon
Yuchen Wang, Takuya Matsuda, Yuta Murotani +5
We investigate the role of ultrafast strain on the electronic and optical responses in topological antiferromagnet MnSn thin films using near-infrared femtosecond pump-probe sp…
Signature of inverse orbital Hall effect in silicon studied using time-resolved terahertz polarimetry
Ami Mi Shirai, Kota Aikyo, Yuta Murotani +6
We investigated the anomalous Hall conductivity induced in silicon by circularly polarized light at room temperature using near-infrared (NIR) pump-terahertz (THz) probe spectrosco…
Correction of broadband terahertz electro-optic sampling with GaSe crystals
Kotaro Ogawa, Natsuki Kanda, Yuta Murotani +3
Gallium selenide (GaSe) is an efficient nonlinear crystal for electro-optic (EO) sampling in the multi-terahertz (THz) frequency range. However, the lattice resonance at several TH…
Calculations in Unified theory of the photovoltaic Hall effect by field- and light-induced Berry curvatures
Yuta Murotani, Tomohiro Fujimoto, Ryusuke Matsunaga
Photovoltaic Hall effect is an interesting platform of Berry curvature engineering by external fields. Floquet engineering aims at generation of light-induced Berry curvature assoc…
Unified theory of the photovoltaic Hall effect by field- and light-induced Berry curvatures
Yuta Murotani, Tomohiro Fujimoto, Ryusuke Matsunaga
Photovoltaic Hall effect, i.e., generation of a photocurrent perpendicular to the bias electric field, is an interesting platform of Berry curvature engineering by external fields.…
Robust asynchronous optical sampling terahertz spectroscopy using commercially available free-running lasers
Mayuri Nakagawa, Natsuki Kanda, Hidekazu Nakamae +2
This study presents asynchronous optical sampling (ASOPS) terahertz spectroscopy using commercially available Ti:Sapphire lasers without stabilizing repetition frequency. Our postp…
Valley polarization dynamics of photoinjected carriers at the band edge in room-temperature silicon studied by terahertz polarimetry
Ami M. Shirai, Yuta Murotani, Tomohiro Fujimoto +3
Sixfold-degenerate valleys in Si have attracted considerable attention for valleytronics application. Using optical pump-terahertz (THz) probe spectroscopy, we study the dynamics o…
Light-induced inverse spin Hall effect and field-induced circular photogalvanic effect in GaAs revealed by two-dimensional terahertz Fourier analysis
Tomohiro Fujimoto, Yuta Murotani, Tomohiro Tamaya +7
The electromotive force transverse to a bias field under irradiation of circularly polarized light, namely the photovoltaic Hall response or light-induced anomalous Hall effect, ha…
Programmable generation of counterrotating bicircular light pulses in the multi-terahertz frequency range
Kotaro Ogawa, Natsuki Kanda, Yuta Murotani +1
The manipulation of solid states using intense infrared or terahertz light fields is a pivotal area in contemporary ultrafast photonics research. While conventional circular polari…
Emergence of high-mobility carriers in topological kagome bad metal MnSn by intense photoexcitation
Takuya Matsuda, Tomoya Higo, Kenta Kuroda +13
Kagome-lattice materials offer novel playgrounds of exploring topologically nontrivial states of electrons under influence of many-body interactions. A noncollinear kagome antiferr…
Anomalous Hall transport by optically injected isospin degree of freedom in Dirac semimetal thin film
Yuta Murotani, Natsuki Kanda, Tomohiro Fujimoto +7
Chirality of massless fermions emergent in condensed matter is a key to understand their characteristic behavior as well as to exploit their functionality. However, chiral nature o…
Time-domain characterization of electric field vector in multi-terahertz pulses using polarization-modulated electro-optic sampling
Natsuki Kanda, Mayuri Nakagawa, Yuta Murotani +1
We demonstrated characterizing the electric field waveform of multi-terahertz pulses (10-50 THz) as vector quantities in the time domain by applying the polarization modulated elec…
Observation of Terahertz Spin Hall Conductivity Spectrum in GaAs with Optical Spin Injection
Tomohiro Fujimoto, Takayuki Kurihara, Yuta Murotani +7
We report the first observation of the spin Hall conductivity spectrum in GaAs at room temperature. Our terahertz polarimetry with a precision of several rads resolves the Farad…
Jitter correction for asynchronous optical sampling terahertz spectroscopy using free-running pulsed lasers
Mayuri Nakagawa, Natsuki Kanda, Toshio Otsu +3
We demonstrate a jitter correction method for asynchronous optical sampling (ASOPS) terahertz (THz) time-domain spectroscopy using two free-running oscillators. This method simulta…
Semiconducting Electronic Structure of the Ferromagnetic Spinel Revealed by Soft-X-Ray Angle-Resolved Photoemission Spectroscopy
Hiroaki Tanaka, Andrei V. Telegin, Yurii P. Sukhorukov +12
We study the electronic structure of the ferromagnetic spinel by soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) and first-p…
Disentangling the Competing Mechanisms of Light-Induced Anomalous Hall Conductivity in Three-Dimensional Dirac Semimetal
Yuta Murotani, Natsuki Kanda, Tomohiro Fujimoto +7
We experimentally elucidate the origin of the anomalous Hall conductivity in a three-dimensional Dirac semimetal, CdAs, driven by circularly polarized light. Using time-res…
Ultrafast Dynamics of Intrinsic Anomalous Hall Effect in the Topological Antiferromagnet Mn3Sn
Takuya Matsuda, Tomoya Higo, Takashi Koretsune +8
We investigate ultrafast dynamics of the anomalous Hall effect (AHE) in the topological antiferromagnet Mn3Sn with sub-100 fs time resolution. Optical pulse excitations largely ele…
Stimulated Rayleigh Scattering Enhanced by a Longitudinal Plasma Mode in a Periodically Driven Dirac Semimetal CdAs
Yuta Murotani, Natsuki Kanda, Tatsuhiko N. Ikeda +6
Using broadband (12-45 THz) multi-terahertz spectroscopy, we show that stimulated Rayleigh scattering dominates the transient optical conductivity of cadmium arsenide, a Dirac semi…
Tracking ultrafast change of multiterahertz broadband response functions in a photoexcited Dirac semimetal CdAs thin film
Natsuki Kanda, Yuta Murotani, Takuya Matsuda +5
The electromagnetic response of Dirac semimetals in the infrared and terahertz frequency ranges is attracting growing interest for potential applications in optoelectronics and non…
Optical parametric amplification of phase-stable terahertz-to-midinfrared pulses studied in the time domain
Natsuki Kanda, Nobuhisa Ishii, Jiro Itatani +1
We report optical parametric amplification (OPA) of low-frequency infrared pulses in the intermediate region between terahertz (THz) frequency and mid-infrared (MIR), i.e., from 16…
Room-Temperature Terahertz Anomalous Hall Effect in Weyl Antiferromagnet MnSn Thin Films
Takuya Matsuda, Natsuki Kanda, Tomoya Higo +3
Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however their smaller responses to external field inhibit device appli…