Ryoma Kaneko
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View article: Carbon‐Related Trap Dynamics in Semi‐Insulating Buffer Layer of GaN‐on‐Si Substrate
Carbon‐Related Trap Dynamics in Semi‐Insulating Buffer Layer of GaN‐on‐Si Substrate Open
Semi‐insulating carbon‐doped GaN (C‐GaN) is essential for high‐power GaN‐on‐Si field effect transistors. Nevertheless, trap parameters and carrier dynamics in C‐GaN are controversial. This paper investigates transient characteristics relat…
View article: Phonon excitations in Eu<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub> probed by inelastic x-ray scattering
Phonon excitations in Eu<sub>2</sub>Ir<sub>2</sub>O<sub>7</sub> probed by inelastic x-ray scattering Open
The study of phonon dynamics and its interplay with magnetic ordering is crucial for understanding the unique quantum phases in the pyrochlore iridates. Here, through inelastic x-ray scattering on a single crystal sample of the pyrochlore …
View article: Fully filling-controlled pyrochlore ruthenates: Emergent ferromagnetic-metal state and geometrical Hall effect
Fully filling-controlled pyrochlore ruthenates: Emergent ferromagnetic-metal state and geometrical Hall effect Open
Carrier doping to the Mott insulator is essential to produce highly correlated metals with emergent properties. Pyrochlore ruthenates, Pr$_{2}$Ru$_{2}$O$_{7}$ (Ru-$4d$ electron number, $n=4$) and Ca$_{2}$Ru$_{2}$O$_{7}$ ($n=3$), are a Mott…
View article: Evolution of possible Weyl semimetal states across the Mott transition in pyrochlore iridates induced by hole doping
Evolution of possible Weyl semimetal states across the Mott transition in pyrochlore iridates induced by hole doping Open
We study possible Weyl semimetals of strongly-correlated electrons by\ninvestigating magnetotransport properties in pyrochlore R2Ir2O7 (R=rare-earth\nions), choosing three types of R ions to design the exchange coupling scheme\nbetween R 4…
View article: Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2
Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2 Open
The Weyl semimetal (WSM), which hosts pairs of Weyl points and accompanying Berry curvature in momentum space near Fermi level, is expected to exhibit novel electromagnetic phenomena. Although the large optical/electronic responses such as…
View article: Phonon anomalies in pyrochlore iridates studied by Raman spectroscopy
Phonon anomalies in pyrochlore iridates studied by Raman spectroscopy Open
We report polarization-resolved Raman scattering measurements on single crystals of the pyrochlore compound Eu2Ir2O7 which exhibits a ground state with noncollinear magnetic order, as well as its paramagnetic counterpart Pr2Ir2O7. The spec…
View article: Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate
Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate Open
View article: Magnetic-field induced multiple topological phases in pyrochlore iridates with Mott criticality
Magnetic-field induced multiple topological phases in pyrochlore iridates with Mott criticality Open
The interplay between electron correlation and spin–orbit coupling in solids has been proven to be an abundant gold mine for emergent topological phases. Here we report the results of systematic magnetotransport study on bandwidth-controll…