150 citations · 523 across the 18 of their papers we have counts for
18 papers
Distinct amplitude mode dynamics upon resonant and off-resonant excitation across the charge density wave energy gap in LaTe3 investigated by time- and angle-resolved photoemission spectroscopy
Kecheng Liu, Takeshi Suzuki, Yigui Zhong +8
Non-equilibrium states generated by ultrafast laser pulses are characterized by specific phenomena that are not accessible in static measurements. Previous time- and angle-resolved…
Unveiling van Hove singularity modulation and fluctuated charge order in kagome superconductor via time-resolved ARPES
Yigui Zhong, Takeshi Suzuki, Hongxiong Liu +10
Kagome superconductor CsV3Sb5, which exhibits intertwined unconventional charge density wave (CDW) and superconductivity, has garnered significant attention recently. Despite exten…
Time- and angle-resolved photoemission spectroscopy with wavelength-tunable pump and extreme ultraviolet probe enabled by twin synchronized amplifiers
Takeshi Suzuki, Yigui Zhong, Kecheng Liu +3
We describe a setup for time- and angle-resolved photoemission spectroscopy with wavelength-tunable excitation and extreme ultraviolet probe. It is enabled by using the 10 kHz twin…
Photo-induced nonlinear band shift and valence transition in SmS
Yitong Chen, Takuto Nakamura, Hiroshi Watanabe +12
The photo-induced band structure variation of a rare-earth-based semiconductor, samarium monosulfide (SmS), was investigated using high-harmonic-generation laser-based time-resolve…
Phase-resolved frequency-domain analysis of the photoemission spectra for photoexcited 1T-TaS2 in the Mott insulating charge density wave state
Q. -H. Ren, T. Suzuki, T. Kanai +3
We investigate the nonequilibrium electronic structure of 1T-TaS2 by time- and angle-resolved photoemission spectroscopy. We observe that strong photoexcitation induces the collaps…
100-mJ class, sub-two-cycle, carrier-envelope phase-stable dual-chirped optical parametric amplification
Lu Xu, Bing Xue, Nobuhisa Ishii +3
Based on the dual-chirped optical parametric amplification and type-I BiBO(BiBO) crystals, the generation of 100 mJ, 10.4 fs, 10 Hz, carrier-to-envelope phase (CEP)-stab…
Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe
Mario Okawa, Yuka Akabane, Mizuki Maeda +14
We report time- and angle-resolved photoemission spectroscopy on SnSe which currently attracts great interest due to its extremely high thermoelectric performance. Laser-assisted p…
Photo-excitation band-structure engineering of 2H-NbSe probed by time- and angle-resolved photoemission spectroscopy
Mari Watanabe, Takeshi Suzuki, Takashi Someya +8
We investigated the nonequilibrium electronic structure of 2H-NbSe by time- and angle-resolved photoemission spectroscopy. We find that the band structure is distinctively modu…
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…
High-harmonic generation in GaAs beyond the perturbative regime
Peiyu Xia, Tomohiro Tamaya, Changsu Kim +6
We experimentally study the field-intensity dependence of high-harmonic generation in bulk gallium arsenide in reflection geometry. We find the oscillatory behavior at high fields…
Detecting electron-phonon couplings during photo-induced phase transition
Takeshi Suzuki, Yasushi Shinohara, Yangfan Lu +13
Photo-induced phase transitions have been intensively studied owing to the ability to control a material of interest in the ultrafast manner, which can induce exotic phases unable…
Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd3As2
Bing Cheng, Natsuki Kanda, Tatsuhiko N. Ikeda +7
We report strong terahertz (~10^12 Hz) high harmonic generation in thin films of Cd3As2, a three-dimensional Dirac semimetal at room temperature. The third harmonics is detectable…
Photo-induced Superconducting State with Long-lived Disproportionate Band Filling in FeSe
Takeshi Suzuki, Takashi Someya, Takahiro Hashimoto +11
Photo-excitation is a very powerful way to instantaneously drive a material into a novel quantum state without any fabrication, and variable ultrafast techniques have been develope…
Ultrafast unbalanced electron distributions in quasicrystalline 30° twisted bilayer graphene
T. Suzuki, T. Iimori, S. J. Ahn +15
Layers of twisted bilayer graphene exhibit varieties of exotic quantum phenomena1-5. Today, the twist angle Θ has become an important degree of freedom for exploring novel states o…
Real-time observation of electronic, vibrational, and rotational dynamics in nitric oxide with attosecond soft X-ray pulses at 400 eV
Nariyuki Saito, Hiroki Sannohe, Nobuhisa Ishii +7
Photoinduced quantum dynamics in molecules have hierarchical temporal structures with different energy scales that are associated with electron and nuclear motions. Femtosecond-to-…
Photo-induced semimetallic states realised in electron-hole coupled insulators
Kozo Okazaki, Yu Ogawa, Takeshi Suzuki +15
Using light to manipulate materials into desired states is one of the goals in condensed matter physics, since light control can provide ultrafast and environmentally-friendly phot…
Antiphase Fermi-surface modulations accompanying displacement excitation in a parent compound of iron-based superconductors
Kozo Okazaki, Hakuto Suzuki, Takeshi Suzuki +12
We investigate the transient electronic structure of BaFe2As2, a parent compound of iron-based superconductors, by time- and angle-resolved photoemission spectroscopy. In order to…
Ultrafast Melting of Spin Density Wave Order in BaFeAs Observed by Time- and Angle-Resolved Photoemission Spectroscopy with Extreme-Ultraviolet Higher Harmonic Generation
H. Suzuki, K. Okazaki, T. Yamamoto +13
Transient single-particle spectral function of BaFeAs, a parent compound of iron-based superconductors, has been studied by time- and angle-resolved photoemission spect…