A5048162182- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Rare-earth and actinide compounds
- 2D Materials and Applications
- Magnetic and Electromagnetic Effects
- Multiferroics and related materials
- Nuclear materials and radiation effects
- Perovskite Materials and Applications
- Geomagnetism and Paleomagnetism Studies
- Advancements in Photolithography Techniques
- Molecular Biology Techniques and Applications
- Particle physics theoretical and experimental studies
- Inorganic Chemistry and Materials
- Crystallization and Solubility Studies
- Topological Materials and Phenomena
- Electronic and Structural Properties of Oxides
- Inorganic Fluorides and Related Compounds
- Crystal Structures and Properties
- Antimicrobial agents and applications
- Neutrino Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Chalcogenide Semiconductor Thin Films
- Characterization and Applications of Magnetic Nanoparticles
The University of Tokyo
2014-2025
Max Planck Institute for Solid State Research
2016-2025
University of Stuttgart
2018-2024
Center for Integrated Quantum Science and Technology
2018-2024
Kyoto University
2023
National Defense Medical College
2014-2021
National Defense Medical College Hospital
2019-2021
Max Planck Society
2014-2019
Wakayama University
2018-2019
Ikeda Municipal Hospital
2018
KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected standard assumptions about propagation at 99.95% C.L. In a 162 ton.yr exposure ratio observed inverse beta-decay to number without disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for energies >3.4 MeV. context two-flavor neutrino oscillations with CPT invariance, all solutions solar problem except "large mixing angle" region are excluded.
Laser pulses are used to enable coherent transport between the copper oxide planes of a cuprate superconductor.
A complex iridium oxide β-Li(2)IrO(3) crystallizes in a hyperhoneycomb structure, three-dimensional analogue of honeycomb lattice, and is found to be spin-orbital Mott insulator with J(eff)=1/2 moment. Ir ions are connected the three neighboring via Ir-O(2)-Ir bonding planes, which very likely gives rise bond-dependent ferromagnetic interactions between moments, an essential ingredient Kitaev model spin liquid ground state. Dominant interaction moments indeed confirmed by temperature...
Abstract The excitonic insulator is a long conjectured correlated electron phase of narrow-gap semiconductors and semimetals, driven by weakly screened electron–hole interactions. Having been proposed more than 50 years ago, conclusive experimental evidence for its existence remains elusive. Ta 2 NiSe 5 semiconductor with small one-electron bandgap E G <50 meV. Below T C =326 K, putative stabilized. Here we report an optical excitation gap op ∼0.16 eV below comparable to the estimated...
The origin of pairing in a superconductor resides the underlying normal state. In cuprate high-temperature YBa2Cu3Oy (YBCO), application magnetic field to suppress superconductivity reveals ground state that appears break translational symmetry lattice, pointing some density-wave order. Here we use comparative study thermoelectric transport cuprates YBCO and La1.8−xEu0.2SrxCuO4 (Eu-LSCO) show two materials exhibit same process Fermi-surface reconstruction as function temperature doping. fact...
Ultrafast spectroscopy reveals coherent oscillations of a phonon-coupled BEC excitons in an excitonic insulator.
We use the Nernst effect to delineate boundary of pseudogap phase in temperature-doping diagram hole-doped cuprate superconductors. New data for coefficient $\ensuremath{\nu}(T)$ ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$ (YBCO), ${\mathrm{La}}_{1.8\ensuremath{-}x}{\mathrm{Eu}}_{0.2}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ (Eu-LSCO), and ${\mathrm{La}}_{1.6\ensuremath{-}x}{\mathrm{Nd}}_{0.4}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ (Nd-LSCO) are presented compared with previously published...
We report the complex dielectric function of quasi-one-dimensional chalcogenide ${\mathrm{Ta}}_{2}{\mathrm{NiSe}}_{5}$, which undergoes a structural phase transition presumably associated with exciton condensation below ${T}_{c}=326$ K [Y. Wakisaka et al., Phys. Rev. Lett. 103, 026402 (2009); Y. F. Lu Nat. Commun. 8, 14408 (2017)], and isostructural ${\mathrm{Ta}}_{2}{\mathrm{NiS}}_{5}$, does not exhibit such transition. Using spectroscopic ellipsometry, we have detected doublets pronounced...
We report the magnetic properties of Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O, a high-entropy oxide with rocksalt structure, and influence substitutions on these properties. From susceptibility neutron diffraction measurements, we found that this compound exhibits long-range order below 120 K despite substantial structural disorder. Other rocksalt-type oxides various chemical were to host either an antiferromagnetic or spin-glass state depending amount ions. The presence for such disordered material...
We present a soft x-ray angle-resolved photoemission spectroscopy study of overdoped high-temperature superconductors. In-plane and out-of-plane components the Fermi surface are mapped by varying angle incident photon energy. No ${k}_{z}$ dispersion is observed along nodal direction, whereas significant antinodal identified for La-based cuprates. Based on tight-binding parametrization, we discuss implications density states near van Hove singularity. Our results suggest that large electronic...
(Ba,K)BiO3 constitute an interesting class of superconductors, where the remarkably high superconducting transition temperature Tc 30 K arises in proximity to charge density wave order. However, precise mechanism behind these phases remains unclear. Here, enabled by high-pressure synthesis, we report superconductivity (Ba,K)SbO3 with a positive oxygen-metal transfer energy contrast (Ba,K)BiO3. The parent compound BaSbO3-δ shows larger gap compared BaBiO3. As order is suppressed via potassium...
The excitonic insulator is an electronically driven phase of matter that emerges upon the spontaneous formation and Bose condensation excitons. Detecting this exotic order in candidate materials a subject paramount importance, as size gap band structure establishes potential collective state for superfluid energy transport. However, identification real solids hindered by coexistence structural parameter with same symmetry order. Only few are currently believed to host dominant phase, Ta 2...