Avsar, Ahmet and Tan, Jun Y. and Kurpas, Marcin and Gmitra, Martin and Watanabe, Kenji and Taniguchi, Takashi and Fabian, Jaroslav and Ozyilmaz, Barbaros (2017) Gate-tunable black phosphorus spin valve with nanosecond spin lifetimes. NATURE PHYSICS, 13 (9). 888-+. ISSN 1745-2473, 1745-2481
Full text not available from this repository. (Request a copy)Abstract
Two-dimensional materials offer new opportunities for both fundamental science and technological applications, by exploiting the electron's spin. Although graphene is very promising for spin communication due to its extraordinary electron mobility, the lack of a bandgap restricts its prospects for semiconducting spin devices such as spin diodes and bipolar spin transistors. The recent emergence of two-dimensional semiconductors could help overcome this basic challenge. In this letter we report an important step towards making two-dimensional semiconductor spin devices. We have fabricated a spin valve based on ultrathin (similar to 5 nm) semiconducting black phosphorus (bP), and established fundamental spin properties of this spin channel material, which supports all electrical spin injection, transport, precession and detection up to room temperature. In the non-local spin valve geometry we measure Hanle spin precession and observe spin relaxation times as high as 4 ns, with spin relaxation lengths exceeding 6 mu m. Our experimental results are in a very good agreement with first-principles calculations and demonstrate that the Elliott-Yafet spin relaxation mechanism is dominant. We also show that spin transport in ultrathin bP depends strongly on the charge carrier concentration, and can be manipulated by the electric field effect.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FIELD-EFFECT TRANSISTORS; ROOM-TEMPERATURE; TRANSPORT; GRAPHENE; SPINTRONICS; INJECTION; SILICON; MOS2; SEMICONDUCTOR; ACCUMULATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:15 |
| Last Modified: | 25 Feb 2019 13:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1305 |
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