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Some questions on the generalized Hartman effect presented by Kudaka and Matsumoto [S. Kudaka, S. Matsumoto, Phys. Lett. A 375 (2011) 3259] and a comment on them given by Milanović and Radovanović are discussed.
With reference to a particle tunneling through two successive barriers, it seems to have been generally accepted that the tunneling time does not depend on the separation distance between the barriers. This phenomenon has been called the generalized Hartman effect. In this Letter, we point out a lack of mathematical rigor in the reasoning by which this effect was deduced about ten years ago. A mathematically...
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