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Coulomb Blockade and Coherent Single-Cooper-Pair Tunneling in Single Josephson Junctions

Michio Watanabe·David B. Haviland
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Abstract

We have measured the current-voltage characteristics of small-capacitance single Josephson junctions at low temperatures (T < 0.04 K), 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/e^2 = 26 kohm. The negative differential resistance is evidence of coherent single-Cooper-pair tunneling in the single Josephson junction.

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Michio Watanabe, David B. Haviland. 2001-05-28. Coulomb Blockade and Coherent Single-Cooper-Pair Tunneling in Single Josephson Junctions. https://doi.org/10.1103/physrevlett.86.5120

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