Quantum effects and the dissipation by quasiparticle tunneling in arrays of Josephson junctions.
Quantum effects and the dissipation by quasiparticle tunneling in arrays of Josephson junctions.
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约瑟夫森结阵列中准粒子隧道效应和耗散的量子效应。
DOI：
10.1103/physrevb.36.3651
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Gerd Schön
中科院分区：
文献类型：
--
作者：
A. P. Kampf;Gerd Schön
研究了耗散准粒子隧穿电流对d维约瑟夫森结阵列中量子效应和相变的影响。我们展示了如何耗散相变，这是已知的单结在零温度下，是由于多维耦合修改。该转变取决于耗散的强度，但也取决于约瑟夫森耦合能量与电容充电能量的比率e/sup 2//2C。它将有序（超导）状态与无序（电阻）状态分开，其中波动阻止相位相干。在具有小电容结和弱耗散的阵列中，无序相持续到零温度。有限的温度显著地改变了相图。在弱耗散条件下，发现了电阻态和超导态之间的重入跃迁。我们也接触熟悉的d维XY模型的相变，并显示如何充电能量和耗散约瑟夫森结阵列影响这些转变。这些结果对于颗粒超导体是有意义的。
We investigate the influence of dissipative quasiparticle tunneling currents on quantum effects and phase transitions in d-dimensional arrays of Josephson junctions. We show how the dissipative phase transition, which is known from single junctions at zero temperature, is modified due to the multidimensional coupling. The transition depends on the strength of the dissipation but also on the ratio of Josephson coupling energy to the capacitive charging energy e/sup 2//2C. It separates an ordered (superconducting) regime from a disordered (resistive) regime where fluctuations prevent phase coherence. In arrays with small capacitance junctions and weak dissipation, the disordered phase persists down to zero temperature. Finite temperatures modify the phase diagram significantly. A reentrant transition between a resistive and a superconducting state is found for weak dissipation. We also make contact with the familiar phase transitions of d-dimensional XY models and show how the charging energy and dissipation in Josephson-junction arrays influence these transitions. The results are of relevance for granular superconductors.