Extended Data Fig. 9: Dependence of optical spin switching on pump wavelength and power at ν = −1 and D = 0. | Nature

Extended Data Fig. 9: Dependence of optical spin switching on pump wavelength and power at ν = −1 and D = 0.

From: Optical control over topological Chern number in moiré materials

Extended Data Fig. 9: Dependence of optical spin switching on pump wavelength and power at ν = −1 and D = 0.The alternative text for this image may have been generated using AI.

a, Normalized spectra of the pump and probe beams. The centre wavelength of the pump beam can be tuned from 1,080 to 1,125 nm while keeping the output power constant. b–i, Degree of spin–valley polarization of hole system ⟨Sz⟩ at ν = −1 before (grey circles) and after pumping for approximately 5 s with σ+ (red circles) or σ− (blue circles) circularly polarized light at pump powers Ppump between 10 and 510 nW. Before taking each data point, the system is spin-polarized by applying a magnetic field of 50 mT and ramping it back down to zero. The data are analysed as described in the caption of Extended Data Fig. 8.

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