488 citations · 879 across the 15 of their papers we have counts for
16 papers
g-Factor Enhanced Upper Critical Field in Superconducting PdTe2 due to Quantum Confinement
Kota Yoshimura, Tzu-Chi Hsieh, Huiyang Ma +14
The Pauli limiting field of superconductors determines the maximal possible value of magnetic field at which superconductivity remains possible. For weak-coupling superconductors,…
Deterministic Formation of Single Organic Color Centers in Single-Walled Carbon Nanotubes
Daichi Kozawa, Yuto Shiota, Yuichiro K. Kato
Quantum light sources using single-walled carbon nanotubes show promise for quantum technologies but face challenges in achieving precise control over color center formation. Here…
Strongly hybridized phonons in one-dimensional van der Waals crystals
Shaoqi Sun, Qingyun Lin, Yihuan Li +7
The phenomena of pronounced electron-electron and electron-phonon interactions in one-dimensional (1D) systems are ubiquitous, which are well described by frameworks of Luttinger l…
Intrinsic process for upconversion photoluminescence via -momentum phonon coupling in carbon nanotubes
Daichi Kozawa, Shun Fujii, Yuichiro K. Kato
We investigate the intrinsic microscopic mechanism of photon upconversion in air-suspended single-walled carbon nanotubes through photoluminescence and upconversion photoluminescen…
Van der Waals functionalization of ultrahigh-Q silica microcavities for - hybrid nonlinear photonics
Shun Fujii, Nan Fang, Daiki Yamashita +3
Optical nonlinear processes are indispensable in a wide range of applications including ultrafast laser sources, microscopy, metrology, and quantum information technologies. Combin…
Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures
N. Fang, Y. R. Chang, S. Fujii +9
The development of van der Waals heterostructures has introduced unconventional phenomena that emerge at atomically precise interfaces. For example, interlayer excitons in two-dime…
An Irreversible Synthetic Route to an Ultra-Strong Two-Dimensional Polymer
Yuwen Zeng, Pavlo Gordiichuk, Takeo Ichihara +14
Polymers that extend covalently in two dimensions have attracted recent attention as a means of combining the mechanical strength and in-plane energy conduction of conventional two…
Quantum emission assisted by energy landscape modification in pentacene-decorated carbon nanotubes
Zhen Li, Keigo Otsuka, Daiki Yamashita +2
Photoluminescent carbon nanotubes are expected to become versatile room-temperature single-photon sources that have applications in quantum information processing. Quantum emission…
Formation of Organic Color Centers in Air-Suspended Carbon Nanotubes Using Vapor-Phase Reaction
D. Kozawa, X. Wu, A. Ishii +7
Organic color centers in single-walled carbon nanotubes have demonstrated exceptional ability to generate single photons at room temperature in the telecom range. Combining the col…
Observation and Spectral Assignment of a Family of Hexagonal Boron Nitride Lattice Defects
Daichi Kozawa, Ananth Govind Rajan, Sylvia Xin Li +15
Atomic vacancy defects in single unit cell thick hexagonal boron nitride are of significant interest because of their photophysical properties, including single-photon emission, an…
Photodetection in p-n junctions formed by electrolyte-gated transistors of two-dimensional crystals
Daichi Kozawa, Jiang Pu, Ryo Shimizu +8
Transition metal dichalcogenide (TMDC) monolayers have attracted much attention due to their strong light absorption and excellent electronic properties. These advantages make this…
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…
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…
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…
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…