Tunneling enhancement through a barrier surrounded by a mesoscopic cavity
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We examine the conductance behavior of a cavity containing a relatively opaque transverse barrier. We show that the transmission of this structure is strongly dependent on the longitudinal position of the barrier and, in particular, has a maximum value when the barrier is located exactly in the middle of the cavity. In this specific condition the overall conductance is much greater than that associated with the barrier alone. Finally we propose a physical interpretation for the obtained numerical results.
KeywordsMesoscopic cavity Tunnel barrier Tunneling enhancement
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