My. Azbel et Vm. Tsukernik, TUNNELING IN AN ALTERNATING POTENTIAL - MULTIPLE, FRACTAL AND CHAOTICACTIVATION RESONANCES, Europhysics letters, 41(1), 1998, pp. 7-12
Tunneling through an alternating potential leads to activation. We pre
dict its fractal (Hofstadter butterfly-type) and chaotic resonances, w
hose cut-offs are related to the alternating potential strength. At lo
w frequencies activation exhibits strong dispersion and high-frequenci
es generation.