Tohoku University · Physics and Astronomy
Professor Kohei Fujiwara's research lab specializes in the discovery and characterization of novel functional materials, with a focus on topological quantum materials and amorphous semiconductors. The lab investigates the electronic and transport properties of materials such as magnetic Weyl semimetals and Fe-Sn amorphous films, exploring phenomena like the anomalous Hall and Nernst effects arising from short-range topological order. They also study organic anion transporters in biological systems, particularly in thyroid hormone transport, bridging materials science and molecular biology. Their work combines advanced thin-film fabrication techniques with sophisticated electronic and magnetic measurements to uncover new physics and potential applications in spintronics and bioelectronics.
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We have recently identified that rat organic anion transporters, polypeptide2 (oatp2) and oatp3, both of which transport thyroid hormones. However, in humans the molecular organization of the organic anion transporters has diverged, and the responsible molecule for thyroid hormone transport has not been clarified, except for human liver-specific transporter (LST-1) identified by us. In this study we isolated and characterized a novel human organic anion transporter, OATP-E from human brain. The
Amorphous semiconductors are widely applied to electronic and energy-conversion devices owing to their high performance and simple fabrication processes. The topological concept of the Berry curvature is generally ill-defined in amorphous solids, due to the absence of long-range crystalline order. Here, we demonstrate that the Berry curvature in the short-range crystalline order of kagome-lattice fragments effectively contributes to the anomalous electrical and magneto-thermoelectric properties
We synthesized the magnetic Weyl semimetal candidate Co3Sn2S2 as a thin film using the co-sputtering technique. By adjusting the film composition using a sulfur-rich SnS1.5 target with Co metal chips attached, we obtained highly crystallized, single-phase Co3Sn2S2 films. The films showed a ferromagnetic transition around 180 K with perpendicular remanent magnetization. We observed the anomalous Hall effect with a tangent of Hall angle of 0.20 at 130 K, as previously reported for the bulk single
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