Coulomb Blockade and Coherent Single-Cooper-Pair Tunneling in Single Josephson Junctions
Michio Watanabe, David B. Haviland
DOI 10.1103/PhysRevLett.86.5120 · Physical Review Letters
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Abstract
We have measured the current-voltage characteristics of small-capacitance single Josephson junctions at low temperatures ( T≤0.04K), where the strength of the coupling between the single junction and the electromagnetic environment was controlled with one-dimensional arrays of dc SQUIDs. We have clearly observed Coulomb blockade of Cooper-pair tunneling and even a region of negative differential resistance, when the zero-bias resistance of the SQUID arrays is much higher than the quantum resistance h/e2≈26kΩ. The negative differential resistance is evidence of coherent single-Cooper-pair tunneling in the single Josephson junction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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