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Journal articles
Semiclassical tunnelling of wavepackets with real trajectories
Abstract : Semiclassical approximations for tunnelling processes usually involve complex trajectories or complex times. In this paper, we use a previously derived approximation involving only real trajectories propagating in real time to describe the scattering of a Gaussian wavepacket by a finite square potential barrier. We show that the approximation describes both tunnelling and interferences very accurately in the limit of small Planck's constant. We use these results to estimate the tunnelling time of the wavepacket and find that, for high energies, the barrier slows down the wavepacket but that it speeds it up at energies comparable to the barrier height.
keyword :
quantum tunneling
semiclassical approximation
Cited literature [14 references]
https://hal-ens-lyon.archives-ouvertes.fr/ensl-00462988
Contributor : Ludovic Jaubert Connect in order to contact the contributor
Submitted on : Monday, March 22, 2010 - 4:33:12 PM
Last modification on : Friday, March 27, 2020 - 5:42:37 PM
Long-term archiving on: : Tuesday, September 28, 2010 - 11:41:24 AM
Contributor : Ludovic Jaubert Connect in order to contact the contributor
Submitted on : Monday, March 22, 2010 - 4:33:12 PM
Last modification on : Friday, March 27, 2020 - 5:42:37 PM
Long-term archiving on: : Tuesday, September 28, 2010 - 11:41:24 AM
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0609016v2.pdf
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Distributed under a Creative Commons Attribution 4.0 International License