Figure 2

(a) Time-resolved reflectivity change of both planar samples A (blue) and B (purple). (b) FFT spectrum of the planar MBE grown bilayer (unrolled sample A as in the left part of Fig. 1). The inset shows the extracted time-resolved reflectivity change. (c) FFT spectrum of the planar MBE grown layers with an additional layer of Al2O3 (unrolled sample B as in the right part of Fig. 1). The inset shows the extracted time-resolved reflectivity change.