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Quantum Effects in Small-Capacitance Single Josephson Junctions | | Michio Watanabe
; David B. Haviland
; | | Date: |
24 Dec 2002 | | Journal: | Phys. Rev. B vol. 67, 094505 (2003) DOI: 10.1103/PhysRevB.67.094505 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Disordered Systems and Neural Networks | cond-mat.mes-hall cond-mat.dis-nn | | Abstract: | 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. | | Source: | arXiv, cond-mat/0301467 | | Services: | Forum | Review | PDF | Favorites | |
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