Resonant and non-resonant Tunneling through a double barrier

Details Resonant and non-resonant Tunneling through a double barrier Resonant and non-resonant Tunneling through a double barrier

2004-10-17

arxiv.org/abs/quant-ph/0410128v2

Europhysics Letters 70 (2005) 712-718

Physics

Quantum Physics

replaced with some improvements in the text and in the references: pdf (11 pages) produced from a source-file in Word; includi

Scientific paper

10.1209/epl/i2004-10523-8

An explicit expression is obtained for the phase-time corresponding to tunneling of a (non-relativistic) particle through two rectangular barriers, both in the case of resonant and in the case of non-resonant tunneling. It is shown that the behavior of the transmission coefficient and of the tunneling phase-time near a resonance is given by expressions with "Breit-Wigner type" denominators. By contrast, it is shown that, when the tunneling probability is low (but not negligible), the non-resonant tunneling time depends on the barrier width and on the distance between the barriers only in a very weak (exponentially decreasing) way: This can imply in various cases, as well-known, the highly Superluminal tunneling associated with the so-called "generalized Hartman Effect"; but we are now able to improve and modify the mathematical description of such an effect, and to compare more in detail our results with the experimental data for non-resonant tunneling of photons. Finally, as a second example, the tunneling phase-time is calculated, and compared with the available experimental results, in the case of the quantum-mechanical tunneling of neutrons through two barrier-filters at the resonance energy of the set-up.

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