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

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

2001-03-23

arxiv.org/abs/cond-mat/0103502v3

Phys. Rev. Lett. vol. 86, pp. 5120-5123 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 4 pages with 6 embedded figures

Scientific paper

10.1103/PhysRevLett.86.5120

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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