225 citations · 1.4k across the 47 of their papers we have counts for
47 papers
Soft X-Ray Imaging of Magnetopause Reconnection Outflows Under Low Plasma- Solar Wind Conditions
Yosuke Matsumoto, Yoshizumi Miyoshi
We examined soft X-ray emission by the solar wind charge-exchange process around the Earth's magnetosphere using a global magnetohydrodynamic simulation model. The dayside magnetop…
Particle Acceleration by Pickup Process Upstream of Relativistic Shocks
Masanori Iwamoto, Takanobu Amano, Yosuke Matsumoto +2
Particle acceleration at magnetized purely perpendicular relativistic shocks in electron-ion plasmas are studied by means of two-dimensional particle-in-cell simulations. Magnetize…
Electron Acceleration at Rippled Low-Mach-number Shocks in High-beta Collisionless Cosmic Plasmas
Oleh Kobzar, Jacek Niemiec, Takanobu Amano +4
Using large-scale fully-kinetic two-dimensional particle-in-cell simulations, we investigate the effects of shock rippling on electron acceleration at low-Mach-number shocks propag…
Thermal transport signatures of the excitonic transition and associated phonon softening in the layered chalcogenide TaNiSe
Yuan-Shan Zhang, Jan A. N. Bruin, Yosuke Matsumoto +2
The layered compound is a quasi-one-dimensional and narrow-gap semiconductor, which is proposed to undergo a transition to an excitonic insulator at $T_\mathr…
Mildly relativistic magnetized shocks in electron-ion plasmas -- II. Particle acceleration and heating
Arianna Ligorini, Jacek Niemiec, Oleh Kobzar +7
Particle acceleration and heating at mildly relativistic magnetized shocks in electron-ion plasma are investigated with unprecedentedly high-resolution two-dimensional particle-in-…
Mildly relativistic magnetized shocks in electron-ion plasmas I. Electromagnetic shock structure
Arianna Ligorini, Jacek Niemiec, Oleh Kobzar +8
Mildly relativistic shocks in magnetized electron-ion plasmas are investigated with 2D kinetic particle-in-cell simulations of unprecedentedly high resolution and large scale for c…
A Proper Discretization of Hydrodynamic Equations in the Cylindrical Coordinates for Astrophysical Simulations
Tomoyuki Hanawa, Yosuke Matsumoto
Cylindrical coordinates are often used in computational fluid dynamics, in particular, when one considers gas flow accreting onto a central object. Although the cylindrical coordin…
Radiation Magnetohydrodynamic Simulations of Sub-Eddington accretion Flows in AGN: Origin of Soft X-ray Excess and Rapid Time Variabilities
Taichi Igarashi, Yoshiaki Kato, Hiroyuki R. Takahashi +3
We investigate the origin of the soft X-ray excess component in Seyfert galaxies observed when their luminosity exceeds 0.1% of the Eddington luminosity (). The e…
Kinetic simulation of nonrelativistic perpendicular shocks of young supernova remnants. IV. Electron heating
Artem Bohdan, Martin Pohl, Jacek Niemiec +4
High Mach number collisionless shocks are found in planetary systems and supernova remnants (SNRs). Electrons are heated at these shocks to the temperature well above the Rankine-H…
Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. III. Magnetic reconnection
Artem Bohdan, Martin Pohl, Jacek Niemiec +4
Fully kinetic two-dimensional particle-in-cell simulations are used to study electron acceleration at high-Mach-number nonrelativistic perpendicular shocks. SNR shocks are mediated…
Quantum Paraelectricity in the Kitaev Quantum-Spin-Liquid Candidates HLiIrO and DLiIrO
K. Geirhos, P. Lunkenheimer, M. Blankenhorn +7
H3LiIr2O6 is the first honeycomb-lattice system without any signs of long-range magnetic order down to the lowest temperatures, raising the hope for the realization of an ideal Kit…
Observational Evidence for Stochastic Shock Drift Acceleration of Electrons at the Earth's Bow Shock
T. Amano, T. Katou, N. Kitamura +14
The first-order Fermi acceleration of electrons requires an injection of electrons into a mildly relativistic energy range. However, the mechanism of injection has remained a puzzl…
Field-Orientation Effect on Ferro-Quadrupole Order in PrTi2Al20
Shunichiro Kittaka, Takanori Taniguchi, Kazumasa Hattori +7
Ferro-quadrupole (FQ) order in the non-Kramers doublet system PrTiAl has been investigated via angle-resolved measurements of the specific heat, rotational magneto…
Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. II. Influence of shock-surfing acceleration on downstream electron spectra
Artem Bohdan, Jacek Niemiec, Martin Pohl +3
We explore electron pre-acceleration at high Mach-number nonrelativistic perpendicular shocks at, e.g., young supernova remnants, which are a prerequisite of further acceleration t…
Precursor Wave Amplification by Ion-Electron Coupling through Wakefield in Relativistic Shocks
Masanori Iwamoto, Takanobu Amano, Masahiro Hoshino +5
We investigated electromagnetic precursor wave emission in relativistic shocks by using two-dimensional particle-in-cell simulations. We found that the wave amplitude is significan…
Unveiling Quadrupolar Kondo Effect in the Heavy Fermion Superconductor PrVAl
Mingxuan Fu, Akito Sakai, Naoki Sogabe +3
Heavy fermion metals hosting multipolar local moments set a new stage for exploring exotic spin-orbital entangled quantum phases. In such systems, the quadrupolar Kondo effect serv…
Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. I. Electron shock-surfing acceleration
Artem Bohdan, Jacek Niemiec, Martin Pohl +3
Electron injection at high Mach-number nonrelativistic perpendicular shocks is studied here for parameters that are applicable to young SNR shocks. Using high-resolution large-scal…
A high-order weighted finite difference scheme with a multi-state approximate Riemann solver for divergence-free magnetohydrodynamic simulations
Takashi Minoshima, Takahiro Miyoshi, Yosuke Matsumoto
We design a conservative finite difference scheme for ideal magnetohydrodynamic simulations that attains high-order accuracy, shock-capturing, and divergence-free condition of the…
Evolution of three-dimensional Relativistic Ion Weibel Instability: Competition with Kink Instability
Makoto Takamoto, Yosuke Matsumoto, Tsunehiko N. Kato
In this paper, we report our recent findings on the relativistic Weibel instability and its nonlinear saturation by performing numerical simulations of collisionless plasmas. Analy…
Quantum critical behaviour and Lifshitz transition in intermediate valence -YbAlB
Mihael S. Grbić, Eoin C. T. O'Farrell, Yosuke Matsumoto +11
Intermetallic compounds containing -electron elements have been prototypical materials for investigating strong electron correlations and quantum criticality (QC). Their heavy f…
The Efficiency of Coherent Radiation from Relativistic Shocks
Takanobu Amano, Masanori Iwamoto, Yosuke Matsumoto +1
We discuss a mechanism for intense electromagnetic wave emission at an astrophysical relativistic shock in a magnetized collisionless plasma. At the magnetized shock, the particle…
Magnetic Field Saturation of the Ion Weibel Instability in Interpenetrating Relativistic Plasmas
Makoto Takamoto, Yosuke Matsumoto, Tsunehiko N. Kato
The time evolution and saturation of the Weibel instability at the ion Alfvén current are presented by ab initio particle-in-cell simulations. We found that the ion Weibel current…
Giant Anisotropic Magnetoresistance due to Purely Orbital Rearrangement in the Quadrupolar Heavy Fermion Superconductor PrVAl
Yasuyuki Shimura, Qiu Zhang, Bin Zeng +11
We report the discovery of giant and anisotropic magnetoresistance due to the orbital rearrangement in a non-magnetic correlated metal. In particular, we measured the magnetoresist…
Precursor Wave Emission Enhanced by Weibel Instability in Relativistic Shocks
Masanori Iwamoto, Takanobu Amano, Masahiro Hoshino +1
We investigated the precursor wave emission efficiency in magnetized purely perpendicular relativistic shocks in pair plasmas. We extended our previous study to include the depende…