Spin-Orbit Coupling in Hydrogenated Graphene

Gmitra, Martin; Kochan, Denis; Fabian, Jaroslav

doi:10.1103/physrevlett.110.246602

Cited by 198 publications

(320 citation statements)

References 37 publications

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“…Several approaches have been suggested, such as utilizing the proximity effect in graphene/strong SOC material heterostructures [2][3][4], the hydrogenation and fluorination of graphene [5,6], and depositing certain heavy adatoms on graphene [7][8][9][10]. Experimentally, angle-resolved photoemission spectroscopy did not reveal an SOC gap in epitaxial Bi 2 Te 2 Se on chemical vapor deposition (CVD)- grown graphene [11].…”

Section: Introductionmentioning

confidence: 99%

Weak localization of bismuth cluster-decorated graphene and its spin–orbit interaction

Gao

et al. 2017

Front. Phys.

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Weak-localization (WL) measurements were performed in a Bi cluster-decorated graphene sheet. The charge concentration was kept constant, and the amplitude of the conductance correction was suppressed after the Bi-cluster deposition. Detailed WL data were obtained while the gate and temperature were changed. Using E. McCann's formula, the spin-relaxation time was extracted, which was found to increase with the elastic scattering time. This is attributed to the Elliott-Yafet spin relaxation and Kane-Mele type spin-orbit coupling (SOC). The SOC strength was enhanced to 2.64 meV as a result of the first deposition. The coverage effect is discussed according to the measurement after the second deposition.

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Section: Introductionmentioning

confidence: 99%

Weak localization of bismuth cluster-decorated graphene and its spin–orbit interaction

Gao

et al. 2017

Front. Phys.

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“…One such property is the presence of magnetic moments, which is particularly important for graphene spintronics [31][32][33]. Several studies suggest that hydrogenated graphene is indeed magnetic for certain degrees of hydrogenation [34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Optical conductivity of hydrogenated graphene from first principles

2014

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We investigate the effect of hydrogen coverage on the optical conductivity of single-side hydrogenated graphene from first-principles calculations. To account for different degrees of uniform hydrogen coverage we calculate the complex optical conductivity for graphene supercells of various sizes, each containing a single additional hydrogen atom. We use the linearized augmented plane wave method, as implemented in the WIEN2K density functional theory code, to show that the hydrogen coverage strongly influences the complex optical conductivity and thus the optical properties, such as absorption, of hydrogenated graphene. We find that the optical conductivity of graphene in the infrared, visible, and ultraviolet range has different characteristic features depending on the degree of hydrogen coverage. This opens up new possibilities to tailor the optical properties of graphene by reversible hydrogenation, and to determine the hydrogen coverage of hydrogenated graphene samples in the experiment by contact-free optical absorption measurements.

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“…1. Indeed, numerous tight-binding and density functional theory studies have found that adatom impurities induce both types of SOC, with comparable strengths 11,12,14,32,33 .…”

Section: Introductionmentioning

confidence: 99%

Direct coupling between charge current and spin polarization by extrinsic mechanisms in graphene

2016

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Spintronics-the all-electrical control of the electron spin for quantum or classical information storage and processing-is one of the most promising applications of the two-dimensional material graphene. Although pristine graphene has negligible spin-orbit coupling (SOC), both theory and experiment suggest that SOC in graphene can be enhanced by extrinsic means, such as functionalization by adatom impurities. We present a theory of transport in graphene that accounts for the spin-coherent dynamics of the carriers, including hitherto-neglected spin precession processes taking place during resonant scattering in the dilute impurity limit. We uncover a novel "anisotropic spin precession" (ASP) scattering process in graphene, which contributes a large current-induced spin polarization and modifies the standard spin Hall effect. ASP scattering arises from two dimensionality and extrinsic SOC, and apart from graphene, it can be present in other 2D materials or in the surface states of 3D materials with a fluctuating SOC. Our theory also yields a comprehensive description of the spin relaxation mechanisms present in adatom-decorated graphene, including Elliot-Yafet and D'yakonov-Perel relaxation rates, the latter of which can become an amplification process in a certain parameter regime of the SOC disorder potential. Our work provides theoretical foundations for designing future graphene-based integrated spintronic devices.

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Spin-Orbit Coupling in Hydrogenated Graphene

Cited by 198 publications

References 37 publications

Weak localization of bismuth cluster-decorated graphene and its spin–orbit interaction

Weak localization of bismuth cluster-decorated graphene and its spin–orbit interaction

Optical conductivity of hydrogenated graphene from first principles

Direct coupling between charge current and spin polarization by extrinsic mechanisms in graphene

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