A5021170491- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Advanced NMR Techniques and Applications
- Advanced Condensed Matter Physics
- Nuclear physics research studies
- Superconducting Materials and Applications
- Topological Materials and Phenomena
- Diabetes and associated disorders
- Ammonia Synthesis and Nitrogen Reduction
- Diabetes Treatment and Management
- High-pressure geophysics and materials
- Spectroscopy and Quantum Chemical Studies
- Methane Hydrates and Related Phenomena
- Spacecraft and Cryogenic Technologies
- Metabolism and Genetic Disorders
- Diet and metabolism studies
- Quantum Chromodynamics and Particle Interactions
- Radioactive Decay and Measurement Techniques
- Metabolism, Diabetes, and Cancer
- Quantum many-body systems
- Graphene research and applications
Institute of Physics
2023-2024
Chinese Academy of Sciences
2022-2024
Czech Academy of Sciences, Institute of Physics
2022-2023
RIKEN
2007-2022
RIKEN Center for Emergent Matter Science
2013-2022
RIKEN Center for Advanced Photonics
2021-2022
RIKEN Center for Quantum Computing
2021-2022
Tokyo University of Pharmacy and Life Sciences
2018
Nippon Soken (Japan)
2009-2012
Japan Science and Technology Agency
2009
The association of hypertension with insulin resistance has been reported. Troglitazone (CS-045) is a newly developed antidiabetic agent that enhances sensitivity. Its effects have confirmed in diabetic animals and patients. present study was performed to evaluate whether the amelioration hyperinsulinemia by troglitazone lowers blood pressure essential hypertensives. administered orally 18 outpatients complicated mild diabetes at dose 200 mg twice day for 8 weeks. Blood decreased from 164 ±...
An inorganic electride, 12CaO·7Al2O3:e-, synthesized by exclusively replacing oxygen ions in the sub-nanometer-sized cages of 12CaO·7Al2O3 crystal with electrons exhibits a superconducting transition at temperature (Tc) ∼0.4 K. Tc varies range 0.14−0.4 K concentration anionic electrons, which are primarily distributed over crystallographic spaces without occupying any particular framework ions. The precursor electride is composed representative metal oxides, electrical insulators. Thus,...
Ly6Chi monocytes migrate to injured sites and induce inflammation in the acute phase of tissue injury. However, once causes injury are eliminated, monocyte-derived macrophages contribute resolution repair. It remains unclear whether emergence these immunoregulatory is attributed phenotypic conversion inflammatory situ or recruitment bone marrow-derived regulatory cells de novo. Here, we identified a subpopulation that Ym1+Ly6Chi greatly expanded marrow during recovery systemic infiltrating...
Spontaneous symmetry breaking is an important concept in many branches of physics. In helium-3 ((3)He), the leads to orbital chirality superfluid phase known as (3)He-A. Chirality a fundamental property (3)He-A, but its direct detection has been challenging. We report by transport measurements electrons trapped below free surface particular, we observed so-called intrinsic Magnus force experienced moving electron; direction directly reflected chirality. further showed that, at transition,...
Nonlinear transport of electron crystal floating on superfluid 4He is investigated in channels 8 and 15 mum width, where the velocity driving electric field are uniform. At a high excitation, we observe jump caused by decoupling electrons from underlying surface deformation. The obtained at indicates that occurs dynamically deepened deformation as result Bragg-Cherenkov scattering waves. Our results also account for unusual nonlinear reported Glasson et al. [Phys. Rev. Lett. 87, 176802...
Superfluidity in one and three dimensions has been studied for 4He fluid films adsorbed nanopores which are straight channels three-dimensionally connected pores, respectively. We observed the superfluid where thermal phonon wavelengths much longer than channel diameter period of pore connection, respectively, found that onset depends on connection. In channels, density disappears at a temperature far below heat capacity anomaly Ginzburg-Landau transition, while pores dimension, show an...
We have made NMR measurements of the first layer solid ${}^{3}\mathrm{He}$ adsorbed on graphite down to $120\ensuremath{\mu}\mathrm{K}$. Magnetization varies from antiferro- ferromagnetic increasing coverage except for region around $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ commensurate phase. This behavior is very similar that second and understood as due competition among various multiple spin exchanges. The phase exhibits a which not expected simple dependence exchange energies.
Bose fluids restricted in one dimension (1D) are realized by adsorbing ${}^{4}\mathrm{He}$ atoms on the 1D pore walls with a diameter of about 18 \AA{}. The fluid appears above an adsorbed amount after coated inert atoms. Heat capacity was observed to have temperature-linear term at low temperatures. This corresponds phonon heat pores. We estimate velocity and interaction fluid.
We demonstrate, for the first time, that a quasi-one-dimensional Wigner crystal formed on superfluid (4)He with only few electrons in confined direction shows reentrant melting. By transport measurements, we find oscillations current as function of linear density measured at fixed driving voltage high temperatures, and detailed analyses data reveal originate from periodic reduction melting temperature density. Comparison structural phase diagram suggests occurs boundaries between different...
Superfluid properties of $^{4}\mathrm{He}$ adsorbed in nanometer-size channels have been studied using torsional oscillators for several channel diameters ranging from $1.5\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}4.7\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. Clear evidence that exhibits superfluidity larger than $1.8\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ is obtained. The superfluid transition $2.8\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ well understood terms the...
We report details of the observation intrinsic Magnus (IM) force acting on negative and positive ions trapped just below a free surface A phase superfluid 3He (3He-A). From transport measurements along surface, we found that IM acts both ions. also demonstrate could distinguish whether is composed chiral monodomain or multiple domains. For domains, current was to be irreproducible unstable, which reasonably explained by formation domain structure dynamics walls. monodomains, appearance ratio...
Heat capacity measurements have been made down to 5 mK for 3He fluid films adsorbed in one-dimensional (1D) nanometer-scale pores, 28 A diameter, preplated with 4He of 1.47 atomic layers. At low density, the heat shows a density-dependent, Schottky-like peak near 150 asymptoting value corresponding 2D Boltzmann gas at high temperatures. The behavior is attributed crossover from 1D state degenerate indicated by predominantly linear temperature dependence below about 30 mK.
The film growth of ${}^{4}\mathrm{He}$ adsorbed in mesoporous substrates was investigated by accurate vapor pressure measurements for various pore sizes between 18 \AA{} and 47 \AA{}. on the wall forms a cylindrical tube, but does not show capillary condensation. Completion first layer full coverage could be identified all studied. In layer, no size dependence found, indicating that this dominated primarily van der Waals force from substrate. Film after completion, however, has strong...
It was reported that a mixed light metal oxide compound, 12CaO·7Al2O3 (C12A7), which is known as constituent of aluminous cement, became superconductor at an ambient pressure by the exclusive replacement extra-framework oxygen ions in subnanometer-sized crystallographic cages with electrons. Temperature dependences resistivity, magnetic susceptibility, and field dependent resistivity single-crystals thin films revealed superconducting transition temperature (Tc) ∼0.4 K critical ∼30 mT. Tc...
We report the discovery of a new three-dimensional (3D) topological Dirac semimetal (TDS) material KZnBi, coexisting with naturally formed superconducting state on surface under ambient pressure. Using photoemission spectroscopy together first-principles calculations, 3D linear band dispersion is identified. The characteristic features massless fermions are also confirmed by magnetotransport measurements, exhibiting an extremely small cyclotron mass m*=0.012 m0 and high Fermi velocity...
We have investigated the melting process of electron crystals (or Wigner crystals) confined in quasi-one-dimensional channels 10--60 electrons width, formed on surface superfluid $^{4}\text{H}\text{e}$, paying special attention to nonlinear behavior resistivity unique crystal phase, Bragg-Cherenkov (BC) scattering waves. observed that BC disappears at a higher temperature for fewer direction, indicating crystal-like structure persists temperature. show this is understood terms naive model...
The \(p\)-wave superfluid phases of 3He-B and 3He-A are topologically nontrivial. Topological properties manifest themselves as the formation bound states at a surface. Unusual superfluids also appear around impurities, such an ion immersed in liquid 3He. In this article, we present mobility positive negative ions trapped below free surface measured down to 250 μK, which is much lower than temperatures attained previous experiments bulk. Mobility measurements conducted for two purposes: one...
We present transport measurements of electrons on the surface liquid helium confined to a microscopic channel, effective width which can be controlled electrostatically. Above 1 K electron system is liquid-like and conductance varies smoothly with channel width. At lower temperatures forms classical quasi-one-dimensional Wigner crystal (WC). Close WC melting temperature, current oscillates as varied, due reentrant recently reported [H. Ikegami, H. Akimoto, D. G. Rees, K. Kono: Phys. Rev....
Abstract The p -wave superfluid $$^3\hbox {He}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>3</mml:mn> </mml:msup> <mml:mtext>He</mml:mtext> </mml:mrow> </mml:math> is a textbook example of topological superfluids. Among its multiple phases, the B phase ( {He-B}$$ <mml:mtext>He-B</mml:mtext> ) known as state protected by time-reversal symmetry. One important features formation bound states at surface. Notably, such surface Andreev are...
The seminal theoretical works of Berezinskii, Kosterlitz, and Thouless presented a paradigm for phase transitions in condensed matter that are driven by topological excitations. These have been extensively studied the context two-dimensional XY models---coupled compasses---and generated interest quantum simulation. Here, we use circuit quantum-electrodynamics architecture to study critical behavior engineered models through their dynamical response. In particular, examine not only...