title: Anomalously long passage through a rounded-off-step potential due to a new mechanism of multidimensional tunneling.
abstract: The fully complex domain semiclassical theory based upon the complexified stable-unstable manifold theory, which we have developed in our recent studies, is successfully applied to explain anomalous tunneling phenomena numerically observed in a periodically modulated round-off-step potential. Numerical experiments show that tunneling through the oscillating step potential is characterized by a spatially nondecaying tunneling tail and an anomalously slow relaxation. The key is the existence of a critical trajectory exhibiting singular behavior, and the analysis of neighboring trajectories around it reproduces the essence of such anomalous phenomena.
authors.affiliation: The Physics Laboratories, Kyushu Institute of Technology, Kawazu 680-4, Iizuka 820-8502, Japan.
authors.forename: Kin'ya
authors.initials: K
authors.lastname: Takahashi
authors.forename: Kensuke S
authors.initials: KS
authors.lastname: Ikeda