Existence and nonexistence of an intrinsic tunneling time

Details Existence and nonexistence of an intrinsic tunneling time Existence and nonexistence of an intrinsic tunneling time

2009-05-23

arxiv.org/abs/0905.3811v1

Phys. Rev. A 79, 042102 (2009)

Physics

Quantum Physics

11 pages, 4 figures

Scientific paper

10.1103/PhysRevA.79.042102

Using a time operator, we define a tunneling time for a particle going through a barrier. This tunneling time is the average of the phase time introduced by other authors. In addition to the delay time caused by the resonances over the barrier, the present tunneling time is also affected by the branch point at the edge of the energy continuum. We find that when the particle energy is near the branch point, the tunneling time becomes strongly dependent on the width of the incoming wave packet, which implies that there is no intrinsic tunneling time. This effect is related to the quantum uncertainty in the particle's momentum.

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