Extended Data Fig. 1: Resonator imaging comparison.
From: Electromagnetic and gravitational responses of photonic Landau levels
The LDOS in the second excited Landau level with an effective magnetic flux of ΦB/(2π) = −2/3 threading the cone tip highlights the improvements in the resonator design and the imaging system. The previous resonator28 (top left) exhibits substantial diagonal astigmatism, which has been removed in the resonator used here (top right). Images of modes in the lowest Landau level provide estimates of the expectation value of r2 (bottom), errors in which directly cause systematic errors in measurements of the shifted second moment. The substantial reduction in deviations from the ideal system enables measurements of the central charge and extensions to higher Landau levels. Error bars are calculated from the uncertainty in the centre location and waist size of the modes and are all smaller than the symbol size.
