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Title: Graphene electrodynamics in the presence of the extrinsic spin Hall effect
Authors: Huang, Chunli
Chong, Yi Dong
Vignale, Giovanni
Cazalilla, Miguel A.
Keywords: Graphene
Hall Effect
Issue Date: 2016
Source: Huang, C., Chong, Y. D., Vignale, G., & Cazalilla, M. A. (2016). Graphene electrodynamics in the presence of the extrinsic spin Hall effect. Physical Review B, 93(16), 165429-. doi:10.1103/PhysRevB.93.165429
Series/Report no.: Physical Review B
Abstract: We extend the electrodynamics of two-dimensional electron gases to account for the extrinsic spin Hall effect (SHE). The theory is applied to doped graphene decorated with a random distribution of absorbates that induce spin-orbit coupling (SOC) by proximity. The formalism extends previous semiclassical treatments of the SHE to the nonlocal dynamical regime. Within a particle-number conserving approximation, we compute the conductivity, dielectric function, and spin Hall angle in the small frequency and wave vector limit. The spin Hall angle is found to decrease with frequency and wave number, but it remains comparable to its zero-frequency value around the frequency corresponding to the Drude peak. The plasmon dispersion and linewidth are also obtained. The extrinsic SHE affects the plasmon dispersion in the long wavelength limit, but not at large values of the wave number. This result suggests an explanation for the rather similar plasmonic response measured in exfoliated graphene, which does not exhibit the SHE, and graphene grown by chemical vapor deposition, for which a large SHE has been recently reported. Our theory also lays the foundation for future experimental searches of SOC effects in the electrodynamic response of two-dimensional electron gases with SOC disorder.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.93.165429
Rights: © 2016 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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