Observation of inverse spin hall effect in bismuth selenide

Praveen Deorani; Jaesung Son; Karan Banerjee; Nikesh Koirala; Matthew Brahlek; Seongshik Oh; Hyunsoo Yang

doi:10.1103/PhysRevB.90.094403

Observation of inverse spin hall effect in bismuth selenide

Praveen Deorani, Jaesung Son, Karan Banerjee, Nikesh Koirala, Matthew Brahlek, Seongshik Oh, Hyunsoo Yang

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159 Scopus citations

Abstract

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 Bi₂Se₃3 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.

Original language	English
Article number	094403
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.90.094403
State	Published - 2014
Externally published	Yes

Funding

This work is partially supported by the Singapore Ministry of Education Academic Research Fund Tier 1 (R-263-000-A75-750), the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Programme (CRP Award No. NRF-CRP 4-2008-06), National Science Foundation (NSF DMR-0845464), and Office of Naval Research (ONR N000141210456).

Funders	Funder number
National Science Foundation	DMR-0845464
Office of Naval Research	N000141210456
National Research Foundation Singapore	NRF-CRP 4-2008-06
Ministry of Education - Singapore	R-263-000-A75-750

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10.1103/PhysRevB.90.094403

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title = "Observation of inverse spin hall effect in bismuth selenide",

abstract = "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 Bi2Se33 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.",

author = "Praveen Deorani and Jaesung Son and Karan Banerjee and Nikesh Koirala and Matthew Brahlek and Seongshik Oh and Hyunsoo Yang",

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AU - Deorani, Praveen

AU - Son, Jaesung

AU - Banerjee, Karan

AU - Koirala, Nikesh

AU - Brahlek, Matthew

AU - Oh, Seongshik

AU - Yang, Hyunsoo

PY - 2014

Y1 - 2014

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AB - 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 Bi2Se33 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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Observation of inverse spin hall effect in bismuth selenide

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