230 citations · 482 across the 13 of their papers we have counts for
13 papers
Indication of Stochastic Photothermal Dynamics around a Topological Defect in a Chiral Magnet
Dongxue Han, Asuka Nakamura, Takahiro Shimojima +4
Chiral magnets host topologically protected spin textures whose nonequilibrium dynamics are crucial in phase transitions and domain evolution, yet ultrafast defect-mediated process…
Photo- and thermally-induced huge layer decoupling in twisted bilayer WSe
A. Nakamura, Y. Chiashi, T. Shimojima +8
Twisted bilayer systems host a wealth of emergent phenomena, such as flat-band superconductivity, ferromagnetism, and ferroelectricity, arising from moiré superlattices and unconve…
Development of precession Lorentz transmission electron microscopy
Shunsuke Hayashi, Dongxue Han, Hidenori Tsuji +2
Lorentz transmission electron microscopy (LTEM) is a powerful tool for high-resolution imaging of magnetic textures, including their dynamics under external stimuli and ultrafast n…
Development of ultrafast four-dimensional precession electron diffraction
Toshiya Shiratori, Jumpei Koga, Takahiro Shimojima +2
Ultrafast electron diffraction/microscopy technique enables us to investigate the nonequilibrium dynamics of crystal structures in the femtosecond-nanosecond time domain. However,…
Unusual photoinduced crystal structure dynamics in TaTe with double zigzag chain superstructure
J. Koga, Y. Chiashi, A. Nakamura +5
Transition metal dichalcogenides with superperiodic lattice distortions have been widely investigated as the platform of ultrafast structural phase manipulations. Here we performed…
Nano-to-micro spatiotemporal imaging of magnetic skyrmion's life cycle
T. Shimojima, A. Nakamura, X. Z. Yu +4
Magnetic skyrmions are the self-organized topological spin textures behaving like particles. Because of their fast creation and typically long lifetime, experimental verification o…
Nanoscale imaging of unusual photo-acoustic waves in thin flake VTe
A. Nakamura, T. Shimojima, Y. Chiashi +5
Controlling acoustic phonons, the carriers of sound and heat, has been attracting great attention toward the manipulation of sonic and thermal properties in nanometric devices. In…
Ultrafast nematic-orbital excitation in FeSe
T. Shimojima, Y. Suzuki, A. Nakamura +7
The electronic nematic phase is an unconventional state of matter that spontaneously breaks the rotational symmetry of electrons. In iron-pnictides/chalcogenides and cuprates, the…
Multiple-pseudogap phases in hydrogen-doped LaFeAsO system
A. Nakamura, T. Shimojima, T. Sonobe +6
The low energy electronic structure of LaFeAsO1-xHx (0.0 < x < 0.60), the system which exhibits two superconducting domes in its phase diagram, is investigated by utilizing the las…
Direct observation of the lattice dynamics of transition metals using ultrafast electron diffraction
A. Nakamura, T. Shimojima, M. Nakano +2
We report the lattice dynamics of transition metal thin films by using the ultrafast electron diffraction. We observe a suppression of the diffraction intensity in a few picosecond…
Orbital anisotropy underlying the superconducting dome in BaFe(AsP) superconductors
T. Sonobe, T. Shimojima, A. Nakamura +8
We investigate the in-plane anisotropy of Fe 3d orbitals occurring in a wide temperature and composition range of BaFe2(As1-xPx)2 system. By employing the angle-resolved photoemiss…
Momentum-dependent sign-inversion of orbital polarization in superconducting FeSe
Y. Suzuki, T. Shimojima, T. Sonobe +14
We investigate the electronic reconstruction across the tetragonal-orthorhombic structural transition in FeSe by employing polarization-dependent angle-resolved photoemission spect…
Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe
T. Shimojima, Y. Suzuki, T. Sonobe +14
We study superconducting FeSe (Tc = 9 K) exhibiting the tetragonal-orthorhombic structural transition (Ts = 90 K) without any antiferromagnetic ordering, by utilizing angle-resolve…