Transport and spin conversion of multi-carriers in semimetal bismuth
Hiroyuki Emoto (1,2), Yuichiro Ando (1), Gaku Eguchi (1,5), Ryo, Ohshima (1,2) Eiji Shikoh (3), Yuki Fuseya (4), Teruya Shinjo (1), Masashi, Shiraishi (1), (1. Kyoto Univ., 2. Osaka Univ., 3. Osaka City Univ., 4. Univ., Electro-Communications)
TL;DR
This study investigates the transport properties and spin conversion mechanisms in semimetal bismuth, revealing the coexistence of electrons and holes and demonstrating the role of the inverse spin Hall effect in spin conversion.
Contribution
It provides new insights into multi-carrier transport and spin conversion physics in bismuth, a semimetal, using combined electrical and spintronic measurements.
Findings
Electrons are the dominant carriers in bismuth.
Spin conversion is governed by the inverse spin Hall effect.
Coexistence of electrons and holes confirmed by Hall measurements.
Abstract
In this paper, we report on the investigation of (1) the transport properties of multi-carriers in semi-metal Bi and (2) the spin conversion physics in this semimetal system in a ferrimagnetic insulator, yttrium-iron-garnet. Hall measurements reveal that electrons and holes co-exist in the Bi, with electrons being the dominant carrier. The results of a spin conversion experiment corroborate the results of the Hall measurement; in addition, the inverse spin Hall effect governs the spin conversion in the semimetal/insulator system. This study provides further insights into spin conversion physics in semimetal systems.
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