Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-06-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages 10 figures, Invited article for the special issue on "Conductivity of single molecules and supramolecular architectur
Scientific paper
We discuss the role of electron-electron and electron-phonon correlations in current flow in the Coulomb Blockade regime, focusing specifically on nontrivial signatures arising from the break-down of mean-field theory. By solving transport equations directly in Fock space, we show that electron-electron interactions manifest as gateable excitations experimentally observed in the current-voltage characteristic. While these excitations might merge into an incoherent sum that allows occasional simplifications, a clear separation of excitations into slow `traps' and fast `channels' can lead to further novelties such as negative differential resistance, hysteresis and random telegraph signals. Analogous novelties for electron-phonon correlation include the breakdown of commonly anticipated Stokes-antiStokes intensities, and an anomalous decrease in phonon population upon heating due to reabsorption of emitted phonons.
Ghosh Avik W.
Muralidharan Bhaskaran
Siddiqui Lutfe
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