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. 2016 Jun 17;7:11744. doi: 10.1038/ncomms11744

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The Berry curvature is calculated from the effective Hamiltonian in the presence of modulation. Subplots (a–d) correspond to the four dipolar bands, from lower to higher frequency, respectively. The parameters used are ν₀=ω₀/2π=31.13 kHz, κ=0.3ν₀, J=0.7 × 10⁻²ν₀, δν=0.036ν₀ and ν_m=ω_m/2π=3 kHz.

Inline graphic — The Berry curvature is calculated from the effective Hamiltonian in the presence of modulation. Subplots (a–d) correspond to the four dipolar bands, from lower to higher frequency, respectively. The parameters used are ν₀=ω₀/2π=31.13 kHz, κ=0.3ν₀, J=0.7 × 10⁻²ν₀, δν=0.036ν₀ and ν_m=ω_m/2π=3 kHz.