Quantum effects in small-capacitance single Josephson junctions
Michio Watanabe, David B. Haviland
DOI 10.1103/PhysRevB.67.094505 · Physical Review B
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Abstract
We have measured the current-voltage (I−V) characteristics of small-capacitance single Josephson junctions at low temperatures (T=0.02–0.6K), where the strength of the coupling between the single junction and the electromagnetic environment was controlled with one-dimensional arrays of dc superconducting quantum interence devices (SQUIDs). The single-junction I−V curve is sensitive to the impedance of the environment, which can be tuned in situ. We have observed Coulomb blockade of Cooper-pair tunneling and even a region of negative differential resistance, where the zero-bias resistance R0′ of the SQUID arrays is much higher than the quantum resistance RK≡h/e2≈26kΩ. The negative differential resistance is evidence of the coherent single-Cooper-pair tunneling within the theory of current-biased single Josephson junctions. Based on this theory, we have calculated the I−V curves numerically in order to compare then with the experimental ones at R0′≫RK. The numerical calculation agrees with the experiments qualitatively. We also discuss the R0′ dependence of the single-Josephson-junction I−V curve in terms of the superconductor-insulator transition driven by changing the coupling to the environment.
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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