Conductance Fluctuations in a Disordered Double-Barrier Junction

Details Conductance Fluctuations in a Disordered Double-Barrier Junction Conductance Fluctuations in a Disordered Double-Barrier Junction

1995-01-16

arxiv.org/abs/cond-mat/9501062v1

Phys. Rev. B 51 (1995) 14483

Physics

Condensed Matter

12 pages, REVTeX-3.0, 2 figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.51.14483

We consider the effect of disorder on coherent tunneling through two barriers in series, in the regime of overlapping transmission resonances. We present analytical calculations (using random-matrix theory) and numerical simulations (on a lattice) to show that strong mode-mixing in the inter-barrier region induces mesoscopic fluctuations in the conductance $G$ of universal magnitude $e^2/h$ for a symmetric junction. For an asymmetric junction, the root-mean-square fluctuations depend on the ratio $\nu$ of the two tunnel resistances according to ${rms} G = (4e^2/h)\beta^{-1/2} \nu(1+\nu)^{-2}$, where $\beta = 1 (2)$ in the presence (absence) of time-reversal symmetry.

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