Journal
NANO LETTERS
Volume 18, Issue 7, Pages 4403-4408Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b01462
Keywords
2D materials; indium selenide; Rashba spin-orbit coupling; monochalcogenides; 2D electron gas
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Funding
- National Science Foundation [DMR-1151534]
- Ministry of Science and Technology of Taiwan [MOST 106-2627-M-002-035, MOST 105-2119-M-032-002]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1151534] Funding Source: National Science Foundation
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Manipulating the electron spin with the aid of spin orbit coupling (SOC) is an indispensable element of spintronics. Electrostatically gating a material with strong SOC results in an effective magnetic field which can in turn be used to govern the electron spin. In this work, we report the existence and electrostatic tunability of Rashba SOC in multilayer InSe. We observed a gate-voltage-tuned crossover from weak localization (WL) to weak antilocalization (WAL) effect in quantum transport studies of InSe, which suggests an increasing SOC strength. Quantitative analyses of magneto-transport studies and energy band diagram calculations provide strong evidence for the predominance of Rashba SOC in electrostatically gated InSe. Furthermore, we attribute the tendency of the SOC strength to saturate at high gate voltages to the increased electronic density of states-induced saturation of the electric field experienced by the electrons in the InSe layer. This explanation of nonlinear gate voltage control of Rashba SOC can be generalized to other electrostatically gated semiconductor nanomaterials in which a similar tendency of spin orbit length saturation was observed (e.g., nanowire field effect transistors), and is thus of broad implications in spintronics. Identifying and controlling the Rashba SOC in InSe may serve pivotally in devising semiconductor-based spintronic devices in the future.
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