Spin-to-charge conversion in Bi2Se3/Ge(111)

Marchionni, Adele (2021) Spin-to-charge conversion in Bi2Se3/Ge(111). Il nuovo cimento C, 44 (1). pp. 1-8. ISSN 1826-9885

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Abstract

Nowadays, topological insulators (TIs) are receiving an increasing attention. This is due to the fact that these materials exhibit spin-polarized surface states, which can be exploited to convert a spin current into a charge current and vice versa. Here, we investigate a prototypical TI/semiconductor system: a patterned Bi2Se3/Ge(111) heterostructure, where spin-polarized electrons are injected inside Ge by means of optical orientation and detected in a Bi2Se3 bar, after diffusion in the Ge substrate. The spin current is converted into a measurable electric potential by means of the inverse Rashba-Edelstein effect (IREE). We employ a non-local injection-detection scheme, since spin generation and detection are spatially separated. We have studied the IREE signal as a function of the degree of circular polarization and power of the light. Moreover, we estimate the value of the spin-diffusion length in Ge(111) which is ls ≈ 5.8 μm, in agreement with previous literature reports. We thus conclude that the Bi2Se3/Ge(111) can be effectively exploited as a reliable spin detector.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	19 Jul 2021 09:50
Last Modified:	19 Jul 2021 09:50
URI:	http://eprints.bice.rm.cnr.it/id/eprint/21280

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