Signatures of Dynamical Tunneling in the Wave function of a Soft-Walled   Open Microwave Billiard
  Evidence for dynamical tunneling is observed in studies of the transmission, and wave functions, of a soft-walled microwave cavity resonator. In contrast to previous work, we identify the conditions for dynamical tunneling by monitoring the evolution of the wave function phase as a function of energy, which allows us to detect the tunneling process even under conditions where its expected level splitting remains irresolvable. 
Y.-H. Kim, U. Kuhl, H.-J. Stockmann, J. P. Bird