| Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
|---|---|---|
| Page(s) | 640 - 646 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00340-1 | |
| Published online | 01 December 2003 | |
Quantum dot between two superconductors
1
Department of Physics, Ben-Gurion University of the Negev
Beer-Sheva, Israel
2
Forschungszentrum Karlsruhe, Institut für Nanotechnologie
76021 Karlsruhe, Germany
3
I. E. Tamm Department of Theoretical Physics, P. N. Lebedev
Physics Institute 117924 Moscow, Russia
Received:
16
October
2000
Accepted:
30
March
2001
Novel effects emerge from an interplay between
multiple Andreev reflections and Coulomb interaction
in a quantum dot
coupled to superconducting leads
and subject to a finite potential bias V.
Combining an intuitive physical picture
with a rigorous path integral formalism, we
evaluate the current I through the dot and find that
the interaction shifts the subharmonic pattern of
the I-V curve
toward higher V. For a sufficiently
strong interaction the subgap current (at 
)
is virtually suppressed.
PACS: 72.10.-d – Theory of electronic transport; scattering mechanisms / 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, 2001
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