184 citations · 846 across the 21 of their papers we have counts for
21 papers
Ultrafast Control of Crystal Structure in a Topological Charge-Density-Wave Material
Takeshi Suzuki, Yuya Kubota, Natsuki Mitsuishi +15
Optical control of crystal structures is a promising route to change physical properties including topological nature of a targeting material. Time-resolved X-ray diffraction measu…
Picosecond volume expansion drives a later-time insulator-metal transition in a nano-textured Mott Insulator
Anita Verma, Denis Golež, Oleg Yu. Gorobtsov +24
Technology moves towards ever faster switching between different electronic and magnetic states of matter. Manipulating properties at terahertz rates requires accessing the intrins…
Transonic Dislocation Propagation in Diamond
Kento Katagiri, Tatiana Pikuz, Lichao Fang +24
The motion of line defects (dislocations) has been studied for over 60 years but the maximum speed at which they can move is unresolved. Recent models and atomistic simulations pre…
Ultrafast x-ray scattering reveals composite amplitude collective mode in the Weyl charge density wave material (TaSe)I
Quynh L. Nguyen, Ryan A. Duncan, Gal Orenstein +27
We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe)I following photoexcitation with femtosecond infrared laser pulses…
Direct imaging of shock wave splitting in diamond at Mbar pressures
S. S. Makarov, S. A. Dyachkov, T. A. Pikuz +19
The propagation of a shock wave in solids can stress them to ultra-high pressures of millions of atmospheres. Understanding the behavior of matter at these extreme pressures is ess…
Melting of magnetic order in by fs laser pulses
Flavio Giorgianni, Max Burian, Namrata Gurung +19
NaOsO has recently attracted significant attention for the strong coupling between its electronic band structure and magnetic ordering. Here, we used time-resolved magnetic X-r…
Suppression of atomic displacive excitation in photo-induced A phonon mode of bismuth unveiled by low-temperature time-resolved x-ray diffraction
Y. Kubota, Yoshikazu Tanaka, T. Togashi +7
An ultrafast atomic motion of a photo-induced coherent phonon of bismuth at low temperatures was directly observed with time-resolved x-ray diffraction. A cryostat with a window th…
Nanoscale subsurface dynamics of solids upon high-intensity laser irradiation observed by femtosecond grazing-incidence x-ray scattering
Lisa Randolph, Mohammadreza Banjafar, Thomas R. Preston +28
Observing ultrafast laser-induced structural changes in nanoscale systems is essential for understanding the dynamics of intense light-matter interactions. For laser intensities on…
Structurally assisted melting of excitonic correlations in 1T-TiSe2
Max Burian, Michael Porer, Jose R. L. Mardegan +16
The simultaneous condensation of electronic and structural degrees of freedom gives rise to new states of matter, including superconductivity and charge-density-wave formation. Whe…
Photoemission from the gas phase using soft x-ray fs pulses: An investigation of the space-charge effects
Adriano Verna, Giovanni Stefani, Francesco Offi +13
An experimental and computational investigation of the space-charge effects occurring in ultrafast photoelectron spectroscopy from the gas phase is presented. The target sample CF$…
Ultrafast demagnetization of Pt magnetic moment in L1-FePt probed by hard x-ray free electron laser
Kohei Yamamoto, Yuya Kubota, Motohiro Suzuki +15
We demonstrate ultrafast magnetization dynamics in a 5d transition metal using circularly-polarized x-ray free electron laser in the hard x-ray region. A decay time of light-induce…
Dynamics of the photoinduced insulator-to-metal transition in a nickelate film
Vincent Esposito, Laurenz Rettig, Elisabeth M. Bothschafter +24
The control of materials properties with light is a promising approach towards the realization of faster and smaller electronic devices. With phases that can be controlled via stra…
Superfluorescence, free-induction decay, and four-wave mixing: propagation of free-electron laser pulses through a dense sample of helium ions
James R Harries, Hiroshi Iwayama, Susumu Kuma +9
We report an experimental and numerical study of the propagation of free-electron laser pulses (wavelength 24.3 nm) through helium gas. Ionisation and excitation populates the He$^…
Sub-nanometre resolution of atomic motion during electronic excitation in phase-change materials
Kirill V. Mitrofanov, Paul Fons, Kotaro Makino +16
Phase-change materials based on Ge-Sb-Te alloys are widely used in industrial applications such as nonvolatile memories, but reaction pathways for crystalline-to-amorphous phase-ch…
Time-resolved photoemission apparatus achieving sub-20-meV energy resolution and high stability
Y. Ishida, T. Togashi, K. Yamamoto +5
The paper describes a time- and angle-resolved photoemission apparatus consisting of a hemispherical analyzer and a pulsed laser source. We demonstrate 1.48-eV pump and 5.90-eV pro…
Ultrafast energy and momentum resolved dynamics of magnetic correlations in photo-doped Mott insulator SrIrO
M. P. M. Dean, Yue Cao, X. Liu +32
Measuring how the magnetic correlations throughout the Brillouin zone evolve in a Mott insulator as charges are introduced dramatically improved our understanding of the pseudogap,…
Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states: (I) Experiment
Kyo Nakajima, James R. Harries, Hiroshi Iwayama +8
In this paper, we report the results of measurements of the intensities and delays of super-radiance decays from excited helium atoms at multiple wavelengths. The experiment was pe…
Single-shot 3D structure determination of nanocrystals with femtosecond X-ray free electron laser pulses
Rui Xu, Huaidong Jiang, Changyong Song +26
Coherent diffraction imaging (CDI) using synchrotron radiation, X-ray free electron lasers (X-FELs), high harmonic generation, soft X-ray lasers, and optical lasers has found broad…
Non-thermal hot electrons ultrafastly generating hot optical phonons in graphite
Y. Ishida, T. Togashi, K. Yamamoto +6
Ultrafast dynamics of graphite is investigated by time-resolved photoemission spectroscopy. We observe spectral features of direct photoexcitations, non-thermal electron distributi…
Orbital-dependent modifications of electronic structure across magneto-structural transition in BaFe2As2
T. Shimojima, K. Ishizaka, Y. Ishida +12
Laser angle-resolved photoemission spectroscopy (ARPES) is employed to investigate the temperature (T) dependence of the electronic structure in BaFe2As2 across the magneto-structu…
Observation of superconducting gap in boron-doped diamond by laser-excited photoemission spectroscopy
K. Ishizaka, R. Eguchi, S. Tsuda +13
We have investigated the low energy electronic state of a boron-doped diamond thin film by the ultrahigh resolution laser-excited photoemission spectroscopy. We observed a clear sh…