1.5k citations · 3.1k across the 16 of their papers we have counts for
16 papers
Dynamics of moire trion and its valley polarization in microfabricated WSe2/MoSe2 heterobilayer
Heejun Kim, Duanfei Dong, Yuki Okamura +4
The moire potential, induced by stacking two monolayer semiconductors with slightly different lattice mismatches, acts as periodic quantum confinement for optically generated excit…
Moiré exciton dynamics and moiré exciton-phonon interaction in a WSe/MoSe heterobilayer
Keisuke Shinokita, Yuhei Miyauchi, Kenji Watanabe +2
Moiré patterns with angular mismatch in van der Waals heterostructures composed of atomically thin semiconducting materials are a fascinating platform to engineer the optically gen…
Observation of drastic electronic structure change in one-dimensional moiré crystals
Sihan Zhao, Pilkyung Moon, Yuhei Miyauchi +3
We report the first experimental observation of strong coupling effect in one-dimensional moiré crystals. We study one-dimensional double-wall carbon nanotubes (DWCNTs) in which va…
Detection of collective optic excitations in molten NaI
S. Hosokawa, M. Inui, T. Bryk +6
High-resolution inelastic x-ray scattering measurements were carried out on molten NaI near the melting point at 680C at SPring-8. Small and damped indications of longitudi…
Anisotropic Optical Properties of Layered Germanium Sulfide
Dezhi Tan, Hong En Lim, Feijiu Wang +7
Two-dimensional (2D) layered materials, transition metal dichalcogenides and black phosphorus, have attracted much interest from the viewpoints of fundamental physics and device ap…
Exciton-plasmon Coupling and Electromagnetically Induced Transparency in Monolayer Semiconductors Hybridized with Ag Nanoparticles
Zhao Weijie, Wang Shunfeng, Liu Bo +9
Hybrid systems of excitons strongly coupled to localized surface plasmons supported by metallic nanoparticles define a new approach to control light-matter interactions. Here, we r…
Evidence for Fast Interlayer Energy Transfer in MoSe2/WS2 Heterostructures
Daichi Kozawa, Alexandra Carvalho, Ivan Verzhbitskiy +6
Strongly bound excitons confined in two-dimensional (2D) semiconductors are dipoles with a perfect in-plane orientation. In a vertical stack of semiconducting 2D crystals, such in-…
Enhanced Photovoltaic Performances of Graphene/Si Solar Cells by Insertion of an MoS2 Thin Film
Yuka Tsuboi, Feijiu Wang, Daichi Kozawa +5
Atomically thin layered materials such as graphene and transition-metal dichalcogenides exhibit great potential as active materials in optoelectronic devices because of their high…
Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation
Shinichiro Mouri, Yuhei Miyauchi, Minglin Toh +3
We studied multi-exciton dynamics in monolayer WSe2 using nonlinear photoluminescence (PL) spectroscopy and Monte Carlo simulations. We observed strong nonlinear saturation behavio…
Photocarrier relaxation in two-dimensional semiconductors
Daichi Kozawa, Rajeev Kumar, Alexandra Carvalho +8
Two-dimensional (2D) crystals of semiconducting transition metal dichalcogenides (TMD) absorb a large fraction of incident photons in the visible frequencies despite being atomical…
Nonlinear Photoluminescence Properties of Trions in Hole-doped Single-walled Carbon Nanotubes
Naoto Akizuki, Munechiyo Iwamura, Shinichiro Mouri +7
We studied the excitation density dependence of photoluminescence (PL) spectra of excitons and trions (charged excitons) in hole-doped single-walled carbon nanotubes. We found that…
Size-Dependent Luminescence Properties of Chromatographically-Separated Graphene Quantum Dots
Naoto Fuyuno, Daichi Kozawa, Yuhei Miyauchi +6
We studied the photoluminescence (PL) properties of graphene quantum dots (GQDs) separated by size-exclusion high performance liquid chromatography. The size separation of GQDs was…
Fabrication of single-walled carbon nanotube/Si heterojunction solar cell with high photovoltaic conversion efficiency and stability
Feijiu Wang, Daichi Kozawa, Yuhei Miyauchi +4
The photovoltaic properties of carbon nanotube/Si heterojunction solar cells were investigated using network films of high quality single-walled carbon nanotubes (SWNTs) grown by a…
Tunable Photoluminescence of Monolayer MoS2 via Chemical Doping
Shinichiro Mouri, Yuhei Miyauchi, Kazunari Matsuda
We demonstrate the tunability of the photoluminescence (PL) properties of monolayer (1L)-MoS2 via chemical doping. The PL intensity of 1L-MoS2 was drastically enhanced by the adsor…
Observation of charged excitons in hole-doped carbon nanotubes using photoluminescence and absorption spectroscopy
Ryusuke Matsunaga, Kazunari Matsuda, Yoshihiko Kanemitsu
We report the first observation of trions (charged excitons), three-particle bound states consisting of one electron and two holes, in hole-doped carbon nanotubes at room temperatu…
Femtosecond Excitation Correlation Spectroscopy of Single-Walled Carbon Nanotubes : Analysis Based on Nonradiative Multiexciton Recombination Processes
Yuhei Miyauchi, Kazunari Matsuda, Yoshihiko Kanemitsu
We studied the nonlinear time-resolved luminescence signals due to multiexciton recombination processes in single-walled carbon nanotubes (SWNTs) using femtosecond excitation corre…