Numerical and Experimental Studies of the Elastic Enhancement Factor for 2D Open Systems

We present the results of numerical and experimental studies of the elastic enhancement factorW for microwave rough and rectangular cavities simulating two-dimensional chaotic and partially chaotic quantum billiards in the presence of moderate absorption. We show that for the frequency range ν = 15.0−18.5 GHz, in which the coupling between antennas and the system is strong enough, the values of W for the microwave rough cavity lie below the predictions of random matrix theory and on average above the theoretical results of V. Sokolov and O. Zhirov, Phys. Rev. E 91, 052917 (2015). We also show that for the partially chaotic rectangular billiard the enhancement factor W calculated by applying the Potter–Rosenzweig model with κ = 2.8 ± 0.5 is close to the experimental one