This article has an erratum: [erratum]

Europhys. Lett., 71 (2), pp. 193-199 (2005)
DOI: 10.1209/epl/i2004-10538-1

An intrinsic multi-dimensional mechanism of barrier tunneling

K. Takahashi¹ and K. S. Ikeda<sup>2, 3

1</sup>  The Physics Laboratories, Kyushu Institute of Technology Kawazu 680-4, Iizuka 820-8502, Japan
²  Department of Physics, Faculty of Science and Engineering, Ritsumeikan University Noji-higashi 1-1-1, Kusatsu 525-8577, Japan
³  Center for Nonlinear Phenomena and Complex Systems Université Libre Bruxelles Campus Plaine, CP 231 B-1050 Brussels, Belgium

received 24 December 2004; accepted in final form 17 May 2005
published online 24 June 2005

Abstract
A new semiclassical mechanism of multi-dimensional tunneling, which originates in the complexified stable and unstable manifolds of the unstable saddle (or unstable periodic orbit) on top of the potential barrier, causes a remarkable plateau-like structure in the tunneling spectrum. Such a mechanism is very universal and works when the instanton mechanism breaks down due to the strong coupling between the degrees of freedom.

PACS
05.45.Mt - Quantum chaos; semiclassical methods.
03.65.Xp - Tunneling, traversal time, quantum Zeno dynamics.
03.65.Sq - Semiclassical theories and applications.

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