Time scale of forerunners in quantum tunneling

Details Time scale of forerunners in quantum tunneling Time scale of forerunners in quantum tunneling

2002-06-04

arxiv.org/abs/quant-ph/0206020v1

Physics

Quantum Physics

Revtex4, 14 eps figures

Scientific paper

10.1103/PhysRevA.66.042119

The forerunners preceding the main tunneling signal of the wave created by a source with a sharp onset or by a quantum shutter, have been generally associated with over-the-barrier (non-tunneling) components. We demonstrate that, while this association is true for distances which are larger than the penetration lenght, for smaller distances the forerunner is dominated by under-the-barrier components. We find that its characteristic arrival time is inversely proportional to the difference between the barrier energy and the incidence energy, a tunneling time scale different from both the phase time and the B\"uttiker-Landauer (BL) time.

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