Absence of a transport signature of spin-orbit coupling in graphene with indium adatoms

Abstract

Enhancement of the spin-orbit coupling in graphene may lead to various topological phenomena and also find applications in spintronics. Adatom absorption has been proposed as an effective way to achieve the goal. In particular, great hope has been held for indium in strengthening the spin-orbit coupling and realizing the quantum spin Hall effect. To search for evidence of the spin-orbit coupling in graphene absorbed with indium adatoms, we carry out extensive transport measurements, i.e., weak localization magnetoresistance, quantum Hall effect and non-local spin Hall effect. No signature of the spin-orbit coupling is found. Possible explanations are discussed.

5 pages, 4 figures, with supplementary materials

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• Volkov-Pankratov states in topological graphene nanoribbons
• Alkali doping of graphene: the crucial role of high temperature annealing
• Impurity resonance effects in graphene $vs$ impurity location, concentration and sublattice occupation
• Electronic transport and scattering times in tungsten-decorated graphene
• Influence of interface-induced valley-Zeeman and spin-orbit couplings\\ on transport in graphene-on-WSe${}_2$ heterostructures
• Unexpected hole doping of graphene by osmium adatoms
• Valley-controlled transport in graphene/ WSe${}_2$ heterostructures under an off-resonant polarized light