Quantum Effects in Small-Capacitance Single Josephson Junctions
| dc.creator | Watanabe, Michio | |
| dc.creator | Haviland, David B. | |
| dc.date | 2003-01-24 | |
| dc.date | 2003-03-19 | |
| dc.date.accessioned | 2026-07-25T22:30:40Z | |
| dc.description | We have measured the current-voltage (I-V) characteristics of small-capacitance single Josephson junctions at low temperatures (T=0.02-0.6 K), where the strength of the coupling between the single junction and the electromagnetic environment was controlled with one-dimensional arrays of dc 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, when the zero-bias resistance R_0' of the SQUID arrays is much higher than the quantum resistance R_K = h/e^2 = 26 kohm. The negative differential resistance is evidence of coherent single-Cooper-pair tunneling within the theory of current-biased single Josephson junctions. Based on the theory, we have calculated the I-V curves numerically in order to compare with the experimental ones at R_0' >> R_K. The numerical calculation agrees with the experiments qualitatively. We also discuss the R_0' dependence of the single-Josephson-junction I-V curve in terms of the superconductor-insulator transition driven by changing the coupling to the environment. | |
| dc.description | 11 pages with 14 embedded figures, RevTeX4, final version | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0301467 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0301467 | |
| dc.identifier | Phys. Rev. B vol. 67, 094505 (2003) | |
| dc.identifier | doi:10.1103/PhysRevB.67.094505 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/89753 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.title | Quantum Effects in Small-Capacitance Single Josephson Junctions | |
| dc.type | text |