358 citations · 1k across the 15 of their papers we have counts for
15 papers
Charge-carrier mobility in hydrogen-terminated diamond field-effect transistors
Yosuke Sasama, Taisuke Kageura, Katsuyoshi Komatsu +7
Diamond field-effect transistors (FETs) have potential applications in power electronics and high-output high-frequency amplifications. In such applications, high charge-carrier mo…
Quantum oscillations in diamond field effect transistors with a h-BN gate dielectric
Yosuke Sasama, Katsuyoshi Komatsu, Satoshi Moriyama +8
Diamond has attracted attention as a next-generation semiconductor because of its various exceptional properties such as a wide bandgap and high breakdown electric field. Diamond f…
Topological Valley Currents in Bilayer Graphene/Hexagonal Boron Nitride Superlattices
Kosuke Endo, Katsuyoshi Komatsu, Takuya Iwasaki +8
Graphene superlattices have recently been attracting growing interest as an emergent class of quantum metamaterials. In this paper, we report the observation of nonlocal transport…
Fabry-Pérot resonances and a crossover to the quantum Hall regime in ballistic graphene quantum point contacts
Nurul Fariha Ahmad, Katsuyoshi Komatsu, Takuya Iwasaki +8
We report on the observation of quantum transport and interference in a graphene device that is attached with a pair of split gates to form an electrostatically-defined quantum poi…
Observation of superconductivity in bilayer graphene/hexagonal boron nitride superlattices
Satoshi Moriyama, Yoshifumi Morita, Katsuyoshi Komatsu +9
A class of low-dimensional superconductivity (SC), such as most of "atomic-layer" SCs, has survived only under certain circumstances, implying a role of the substrate. Moreover, in…
Thickness Scaling Effect on Interfacial Barrier and Electrical Contact to Two-Dimensional MoS2 Layers
Song-Lin Li, K. Komatsu, Shu Nakaharai +4
Understanding the interfacial electrical properties between metallic electrodes and low dimensional semiconductors is essential for both fundamental science and practical applicati…
Strain superlattices and macroscale suspension of Graphene induced by corrugated substrates
Antoine Reserbat-Plantey, Dipankar Kalita, Laurence Ferlazzo +11
We investigate the organized formation of strain, ripples and suspended features in macroscopic CVD-prepared graphene sheets transferred onto a corrugated substrate made of an orde…
Thickness-Dependent Interfacial Coulomb Scattering in Atomically Thin Field-Effect Transistors
Song-Lin Li, Katsunori Wakabayashi, Yong Xu +6
Two-dimensional semiconductors are structurally ideal channel materials for the ultimate atomic electronics after silicon era. A long-standing puzzle is the low carrier mobility (μ…
Signature of gate-tunable magnetism in graphene grafted with Pt-porphyrins
Chuan Li, Katsuyoshi Komatsu, G. Clave +4
Inducing magnetism in graphene holds great promises, such as controlling the exchange interaction with a gate electrode and generating exotic magnetic phases. Coating graphene with…
Superconducting proximity effect through graphene from zero field to the Quantum Hall regime
Katsuyoshi Komatsu, Chuan Li, S. Autier-Laurent +2
We investigate the superconducting proximity effect through graphene in the long diffusive junction limit, at low and high magnetic field. The interface quality and sample phase co…
Experimental Evidence of Fluctuation-Dissipation Theorem Violation in a Superspin Glass
Katsuyoshi Komatsu, D. L'Hote, Sawako Nakamae +5
We present the experimental observation of the fluctuation-dissipation theorem (FDT) violation in an assembly of interacting magnetic nanoparticles in the low temperature superspin…
Anisotropy-axis orientation effect on the magnetization of γ-Fe2O3 frozen ferrofluid
Sawako Nakamae, Caroline Thibierge, Katsuyoshi Komatsu +5
The effect of magnetic anisotropy-axis alignment on the superparamagnetic (SPM) and superspin glass (SSG) states in a frozen ferrofluid has been investigated. The ferrofluid studie…
Superspin glass aging behavior in textured and nontextured frozen ferrofluid
Sawako Nakamae, Emmanuelle Dubois, Vincent Dupuis +4
The effect of magnetic anisotropy-axis alignment of individual nanoparticles on the collective aging behavior in the superspin glass state of a frozen ferrofluid has been investiga…
Noise Measurement of Interacting Ferromagnetic Particles with High Resolution Hall Microprobes
K. Komatsu, D. L'Hote, S. Nakamae +7
We present our first experimental determination of the magnetic noise of a superspinglass made of < 1 pico-liter frozen ferrofluid. The measurements were performed with a local mag…
Aging behavior of spin glasses under bond and temperature perturbations from laser illumination
Ryuta Arai, katsuyoshi komatsu, Tetsuya Sato
We have studied the nonequilibrium dynamics of spin glasses subjected to bond perturbation, which was based on the direct change in the spin-spin interaction , using photo illu…