Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complex--Barrier Tunnelling Times   In this paper we calculate the analytic expression of the phase time for the
scattering of an electron off a complex square barrier. As is well known the
(negative) imaginary part of the potential takes into account,
phenomenologically, the absorption. We investigate the so-called
Hartman-Fletcher effect, and find that it is suppressed by the presence of a
(not negligible) imaginary potential. In fact, when a sufficiently large
absorption is present, the asymptotical transmission speed is finite. Actually,
the tunnelling time does increase linearly with the barrier width. A recent
optical experiment seems to be in agreement with our theoretical previsions.

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The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: nlin