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Publication Detail / Abstract

J. W. McIver, B. Schulte, F.-U. Stein, T. Matsuyama, G. Jotzu, G. Meier, A. Cavalleri

Light-induced anomalous Hall effect in graphene

published on Nature Physics on November 4, 2019
> Full text via publisher
Many non-equilibrium phenomena have been discovered or predicted in optically driven quantum solids. Examples include light-induced superconductivity and Floquet-engineered topological phases. These are short-lived effects that should lead to measurable changes in electrical transport, which can be characterized using an ultrafast device architecture based on photoconductive switches. Here, we report the observation of a light-induced anomalous Hall effect in monolayer graphene driven by a femtosecond pulse of circularly polarized light. The dependence of the effect on a gate potential used to tune the Fermi level reveals multiple features that reflect a Floquet-engineered topological band structure, similar to the band structure originally proposed by Haldane. This includes an approximately 60 meV wide conductance plateau centred at the Dirac point, where a gap of equal magnitude is predicted to open. We find that when the Fermi level lies within this plateau the estimated anomalous Hall conductance saturates around 1.8 ± 0.4 e2/h.
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