91 citations · 259 across the 10 of their papers we have counts for
8 papers · 1 filter
Photo-induced Tellurium segregation in
Takumi Fukuda, Ryota Kaburauchi, Yuta Saito +4
We report on the coherent phonon spectroscopy of polymorphic single crystals using a femtosecond-pulsed laser to investigate the relationship between structural p…
Ultrafast dynamics of the low frequency shear mode in
T. Fukuda, K. Makino, Y. Saito +4
We report on the dynamics of coherent phonons in semimetal 1T'-MoTe2 using femtosecond pump-probe spectroscopy. On an ultrafast sub-picosecond time scale at room temperature, a low…
Zener Tunneling Breakdown in Phase-Change Materials Revealed by Intense Terahertz Pulses
Yasuyuki Sanari, Takehiro Tachizaki, Yuta Saito +8
We have systematically investigated the spatial and temporal dynamics of crystallization that occurs in the phase-change material Ge2Sb2Te5 upon irradiation with an intense THz pul…
Ultrafast Dynamics of Electron-phonon Coupling in Transition-metal Dichalcogenides
Kotaro Makino, Yuta Saito, Shuuto Horii +6
Time-domain femtosecond laser spectroscopic measurements of the ultrafast lattice dynamics in 2H-MoTe2 bulk crystals were carried out to understand the carrier-phonon interactions…
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…
Coherent phonon study of (GeTe)(SbTe) interfacial phase change memory materials
Kotaro Makino, Yuta Saito, Paul Fons +4
The time-resolved reflectivity measurements were carried out on the interfacial phase change memory (iPCM) materials ([(GeTe)(SbTe)] and [(GeTe)…
Polarization Dependent Optical Control of Atomic Arrangement in Multilayer Ge-Sb-Te Phase Change Materials
Kotaro Makino, Junji Tominaga, Alexander V. Kolobov +2
We report the optical perturbation of atomic arrangement in the layered GeTe/Sb_{2}Te_{3} phase change memory material. To observe the structural change, the coherent A_{1} mode of…
Ultrafast optical manipulation of atomic arrangements in chalcogenide alloy memory materials
Kotaro Makino, Junji Tominaga, Muneaki Hase
A class of chalcogenide alloy materials that shows significant changes in optical properties upon an amorphous-to-crystalline phase transition has lead to development of large data…