Physics – Condensed Matter – Superconductivity
Scientific paper
1997-12-23
Physics
Condensed Matter
Superconductivity
17 pages, 19 figures (RevTeX)
Scientific paper
10.1103/PhysRevB.58.15120
We calculate the electrical currents through a superconductor - insulator - superconductor junction which is also weakly coupled to a normal metal side probe. The voltage $V$ applied to the normal metal terminal controls the occupation of Andreev energy levels $E_n$, and therefore controls the Josephson current flowing through these levels. Whenever the probe voltage crosses an Andreev level, the Josephson current changes abruptly by an amount equal to the current flowing through the Andreev level. The differential conductance along the normal metal terminal permits spectroscopy of the Andreev levels. In a short junction $(L \ll \xi_0)$, the critical current switches abruptly from the Ambegaokar-Baratoff value to zero when the probe voltage is approximately equal to the superconducting energy gap ($|eV| \simeq \Delta$). The magnitude of the Josephson current switching in a long junction $(L \gg \xi_0)$, and the range of probe voltages over which the Josephson current differs from its equilibrium value, are much smaller than for three-terminal ballistic superconductor - normal metal - superconductor junctions.
Bagwell Philip F.
Demir Hilmi Volkan
Ilhan Tolga H.
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