Summarizes the phonon experiments on arrays of traps of 4 and 2 m lateral size, with different inter-trap separation, and their comparison with the effective potential model. Again, the energies are given with respect to that of the corresponding single trap (identified as “2/isolated” and “4/isolated” in this panel). The arrays are labeled as a / b , with a the trap size, and b the inter-trap separation. The case of an inverted array of 2 m etched regions separated by 2 m non-etched regions (labeled as (2/2) -1 is also included. Circular full (square empty) symbols are the experimental (theoretical) values. Error bars in c and d indicate the standard deviation of ten spectral measurements.
