Coulomb blockade in a quantum wire with long-range Coulomb interactions

Details Coulomb blockade in a quantum wire with long-range Coulomb interactions Coulomb blockade in a quantum wire with long-range Coulomb interactions

1996-02-08

arxiv.org/abs/cond-mat/9602050v2

Europhys. Lett. 38 681 (1997)

Physics

Condensed Matter

11 pages,1 figure, uses epsfig

Scientific paper

10.1209/epl/i1997-00303-0

We study the transport through two impurities or ``barriers'' in a one-dimensional quantum wire, taking into account the long-range $\frac1r$ Coulomb interactions. We compute the temperature-dependent conductance $G(T)$ of this system. Long-range forces lead to a dramatic increase of weak barrier potentials with decreasing temperature, even in the ``resonant'' case. The system thus always reaches a ``strong barrier'' regime in which only charge is pinned, contrary to the standard LL case. $G(T)$ vanishes faster than any power as $T$ goes to zero. In particular, resonant tunneling is suppressed at zero temperature.

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