Single electron tunneling at large conductance: The semiclassical approach |
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Authors: | G Göppert H Grabert |
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Institution: | Fakult?t für Physik, Albert-Ludwigs-Universit?t, Hermann-Herder-Stra?e 3, 79104 Freiburg, Germany, DE
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Abstract: | We study the linear conductance of single electron devices showing Coulomb blockade phenomena. Our approach is based on a
formally exact path integral representation describing electron tunneling nonperturbatively. The electromagnetic environment
of the device is treated in terms of the Caldeira-Leggett model. We obtain the linear conductance from the Kubo formula leading
to a formally exact expression which is evaluated in the semiclassical limit. Specifically we consider three models. First,
the influence of an electromagnetic environment of arbitrary impedance on a single tunnel junction is studied focusing on
the limits of large tunneling conductance and high to moderately low temperatures. The predictions are compared with recent
experimental data. Second, the conductance of an array of N tunnel junctions is determined in dependence on the length N of the array and the environmental impedance. Finally, we consider a single electron transistor and compare our results for
large tunneling conductance with experimental findings.
Received 2 February 2000 |
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Keywords: | PACS 73 23 Hk Coulomb blockade single-electron tunneling - 73 40 Gk Tunneling - 73 40 Rw Metal-insulator-metal structures |
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