Journal
PHYSICAL REVIEW B
Volume 90, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.094403
Keywords
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Funding
- Singapore Ministry of Education Academic Research Fund [R-263-000-A75-750]
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Programme (CRP Award) [NRF-CRP 4-2008-06]
- National Science Foundation [NSF DMR-0845464]
- Office of Naval Research [ONR N000141210456]
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Bismuth Selenide (Bi2Se3) is a topological insulator exhibiting helical spin polarization and strong spin-orbit coupling. The spin-orbit coupling links the charge current to spin current via the spin Hall effect (SHE). We demonstrate a Bi2Se3 spin detector by injecting the pure spin current from a magnetic permalloy layer to a Bi2Se3 thin film and detect the inverse SHE in Bi2Se3. The spin Hall angle of Bi2Se3 is found to be 0.0093 +/- 0.0013 and the spin diffusion length in Bi2Se3 to be 6.2 +/- 0.15 nm at room temperature. Our results suggest that topological insulators with strong spin-orbit coupling can be used in functional spintronic devices.
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