Fig. 5.

Fluctuation induced angular momentum $⟨{\mathcal{L}}_{z,i}⟩$ as a function of the temperature. The cylindrical cavity has radius $R>>c∕{\omega }_{\mathrm{p}}$ and the plasma frequency is (a) ${\omega }_{\mathrm{p}}∕2\pi =1\mathrm{THz}$ and (b) ${\omega }_{\mathrm{p}}∕2\pi =10\mathrm{THz}$. The cyclotron frequency is ${\omega }_{\mathrm{c}}=0.8{\omega }_{\mathrm{p}}$. Solid blue line: contribution from the 1st (low-frequency) band gap. Dot-dashed green line: contribution from the 2nd (high-frequency) band gap. Dashed black line: combined contribution of the two band gaps. Note that the contribution of the modes outside the spectral region of the band-gaps is not included in the calculation