646 research outputs found
Coulomb singularity effects in tunnelling spectroscopy of individual impurities
Non-equilibrium Coulomb effects in resonant tunnelling processes through deep
impurity states are analyzed. It is shown that Coulomb vertex corrections to
the tunnelling transfer amplitude lead to a power-law singularity in current-
voltage characteristicsComment: 7 pages, 2 figure
Phonon assisted tunneling in Josephson junctions
The expression for additional subgap current in the presence of
electron-phonon interaction is derived. We show that the phonon assisted
tunneling leads to appearance of peaks on current-voltage characteristics at
the Josephson frequencies corresponding to the Raman-active phonons. The
relation of the obtained results to experimental observations are discussed.Comment: 8 pages, submitted to PR
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