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 Hartman-Fletcher effect, and find that it is suppressed by the presence of a (non negligible) imaginary potential. In fact, when a suffficiently 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 expectation.
(1994). Complex-Barrier Tunneling Times [journal article - articolo]. In JOURNAL DE PHYSIQUE I. Retrieved from http://hdl.handle.net/10446/125056
Complex-Barrier Tunneling Times
Salesi, Giovanni
1994-01-01
Abstract
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 Hartman-Fletcher effect, and find that it is suppressed by the presence of a (non negligible) imaginary potential. In fact, when a suffficiently 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 expectation.Pubblicazioni consigliate
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