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YOSHIZUMI Toshihiro
| Mathematics, Electronics and Informatics Division | Assistant Professor |
| Department of Electrical Engineering,Electronics, and Applied Physics |
Performance information
■ Paper- Spatiotemporal characteristics of spin transport in compensated metals with electron–hole exchange interaction
Masamichi Sakai; Mst Sanjida Aktar; Toshihiro Yoshizumi; Shigehiko Hasegawa
Journal of Physics: Condensed Matter, Volume：34, Number：5, First page：055801, 2022, [Reviewed]
Abstract
We develop a theory describing spatiotemporal behavior of spin transport in two-band metals by postulating a spin–exchange interaction between electrons and holes. Starting with the semiclassical Boltzmann equation, we derive a system of coupled diffusion equations and solve them analytically under steady-state conditions. The solutions reveal two types of electron–hole coupled-spin transport modes: a dissipative mode and a nondissipative mode with an infinite spin diffusion length. The two modes are the manifestations of two types of spin coupling channels. Besides the exchange interaction, we incorporate into our derivation the relaxation caused by the spin–orbit interaction to show how it affects the spin transport characteristics of the two modes.
IOP Publishing, Scientific journal
DOI：https://doi.org/10.1088/1361-648x/ac327e
DOI ID：10.1088/1361-648x/ac327e, ISSN：0953-8984, eISSN：1361-648X - Hall effect in ytterbium hydrides
Satoru Kitsunai; Daiki Fujii; Toshihiro Yoshizumi; Shigehiko Hasegawa; Osamu Nakamura; Masamichi Sakai
Physics Letters A, Volume：419, First page：127740, Dec. 2021, [Reviewed]
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.physleta.2021.127740
DOI ID：10.1016/j.physleta.2021.127740, ISSN：0375-9601 - Nanoparticulate Pt-catalyzed hydrogenation of Yb films: Towards hydrides with higher hydrogen compositions
Toshihiro Yoshizumi; Keigo Koshiba; Satoru Kitsunai; Teru Yoshizawa; Osamu Nakamura; Masamichi Sakai
Chemical Physics, Volume：544, First page：111121, Apr. 2021, [Reviewed]
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.chemphys.2021.111121
DOI ID：10.1016/j.chemphys.2021.111121, ISSN：0301-0104 - Magneto-transport properties in fcc ytterbium
Toshihiro Yoshizumi; Daiki Fujii; Satoru Kitsunai; Kousuke Igarashi; Masamichi Sakai; Osamu Nakamura; Shigehiko Hasegawa
Physics Letters A, Volume：384, Number：26, First page：126661, Sep. 2020, [Reviewed]
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.physleta.2020.126661
DOI ID：10.1016/j.physleta.2020.126661, ISSN：0375-9601 - Spin and charge transports with thermodynamic electron–hole correlation in nearly compensated metals
Mst. Sanjida Aktar; Masamichi Sakai; Toshihiro Yoshizumi; Shigehiko Hasegawa
AIP Advances, Volume：10, Number：7, First page：075210, Jul. 2020, [Reviewed]
The long spin-relaxation time (τs) toward the large transport distance of spin current (SC) is desirable for practical applications of spintronic devices because spatially and temporally large spin coherence makes spin manipulation easier. Here, we propose that nearly compensated metals (CMs) with electron–hole collisions accompanied by spin flipping have a potential mechanism that makes τs associated with the antiparallel SC extraordinarily long, where antiparallel SC is defined as the vector subtraction of hole and electron SCs. The present theoretical study on spin and charge transports in nearly CMs shows that (i) it is antiparallel SC that satisfies the Onsager reciprocal relation in combination with conventional charge current, (ii) both longitudinal and Hall resistivities are influenced by the enhancement of τs and are classified into two specific mechanisms, i.e., the conventional and the resonance Hall effect accompanied by a sustaining mode of antiparallel SC, and (iii) the resonance Hall effect is not influenced by the spin–orbit interaction unlike the non-resonance case. These findings indicate the potential of nearly CMs in application of spintronic materials.
AIP Publishing, Scientific journal
DOI：https://doi.org/10.1063/5.0013628
DOI ID：10.1063/5.0013628, eISSN：2158-3226 - Field-effect transistor array modified by a stationary phase to generate informative signal patterns for machine learning-assisted recognition of gas-phase chemicals
Toshihiro Yoshizumi; Tatsuro Goda; Rui Yatabe; Akio Oki; Akira Matsumoto; Hiroaki Oka; Takashi Washio; Kiyoshi Toko; Yuji Miyahara
Molecular Systems Design & Engineering, Volume：4, Number：2, First page：386, Last page：389, Jan. 2019, [Reviewed]We propose an artificial intelligence-based chemical-sensing system integrating a porous gate field-effect transistor (PGFET) array modified by gas chromatography stationary phase materials and machine-learning techniques.
Royal Society of Chemistry (RSC), Scientific journal
DOI：https://doi.org/10.1039/c8me00097b
DOI ID：10.1039/c8me00097b, eISSN：2058-9689 - Gas-Sensitive Field-Effect Transistor Incorporating Polymer Layer and Porous Metal Electrode in the Gate Structure
Sensors and Materials, Volume：30, Number：5(1), First page：1001, Last page：1008, May 2018, [Reviewed]
MYU K.K., Scientific journal
DOI：https://doi.org/10.18494/sam.2018.1808
DOI ID：10.18494/sam.2018.1808, ISSN：0914-4935 - Thermionic Electron Emission from a Mayenite Electride–Metallic Titanium Composite Cathode
Toshihiro Yoshizumi; Katsuro Hayashi
Applied Physics Express, Volume：6, Number：1, First page：015802, Last page：015802, Jan. 2013, [Reviewed]
IOP Publishing, Scientific journal
DOI：https://doi.org/10.7567/apex.6.015802
DOI ID：10.7567/apex.6.015802, ISSN：1882-0778, eISSN：1882-0786 - Simultaneous Quantification of Hydride Ions and Electrons Incorporated in 12CaO·7Al2O3 Cages by Deuterium-Labeled Volumetric Analysis
Toshihiro Yoshizumi; Yoji Kobayashi; Hiroshi Kageyama; Katsuro Hayashi
The Journal of Physical Chemistry C, Volume：116, Number：15, First page：8747, Last page：8752, Apr. 2012, [Reviewed]
American Chemical Society (ACS), Scientific journal
DOI：https://doi.org/10.1021/jp2106742
DOI ID：10.1021/jp2106742, ISSN：1932-7447, eISSN：1932-7455 - Iodometric Determination of Electrons Incorporated into Cages in 12CaO·7Al2O3 Crystals
Toshihiro Yoshizumi; Satoru Matsuishi; Sung-Wng Kim; Hideo Hosono; Katsuro Hayashi
The Journal of Physical Chemistry C, Volume：114, Number：36, First page：15354, Last page：15357, Aug. 2010, [Reviewed]
American Chemical Society (ACS), Scientific journal
DOI：https://doi.org/10.1021/jp1054364
DOI ID：10.1021/jp1054364, ISSN：1932-7447, eISSN：1932-7455