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. Author manuscript; available in PMC: 2020 May 4.
Published in final edited form as: Nat Phys. 2019 Nov 4;16(1):38–41. doi: 10.1038/s41567-019-0698-y

Fig. 2. Ultrafast anomalous Hall currents in graphene driven by circularly polarized light.

Fig. 2

a, Time-resolved helicity-dependent anomalous Hall currents Ix [⟳ - ⟲] measured at the photoconductive switch for a positive (red) and negative (black) transverse source-drain voltage Vy. The graphene Fermi level was gated to the Dirac point (EF = 0). Solid lines are based on the signal propagation model in supplementary S3. A small background observed at Vy = 0 was subtracted from the data sets (see supplementary S4). b, Deconvolved anomalous Hall current signals Ig accounting for the response function of the on-chip circuitry. The current amplitude has a ±22% systematic error from the calibration of the photoconductive switch. Solids lines are Gaussian fits.