PHASE-TRANSITIONS IN DISSIPATIVE JOSEPHSON CHAINS - MONTE-CARLO RESULTS AND RESPONSE FUNCTIONS
PHASE-TRANSITIONS IN DISSIPATIVE JOSEPHSON CHAINS - MONTE-CARLO RESULTS AND RESPONSE FUNCTIONS
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DOI：
10.1103/physrevb.45.2294
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发表时间：
1992-02-01
影响因子：
3.7
通讯作者：
ZAIKIN, AD
中科院分区：
文献类型：
--
作者：
BOBBERT, PA;FAZIO, R;ZAIKIN, AD
一个由欧姆电阻分流的约瑟夫森结链在零温度下经历相变，这是由充电效应和耗散引起的量子涨落之间的相互作用引起的。 用时空中的相位滑移表示的量子力学配分函数可以映射到二维库仑气体的配分函数上。 由于耗散，相互作用是各向异性的。 尽管该模型很简单，但对于相图和响应函数并没有普遍的一致意见。 我们已经进行了蒙特卡罗模拟，以确定零温度相边界。 我们发现四个阶段的存在或不存在的全球或地方秩序，在所有的组合。 我们讨论了在不同阶段的响应函数，并发现有趣的传输特性。
A chain of Josephson junctions shunted by Ohmic resistors undergoes phase transitions at zero temperature that result from the interplay between quantum fluctuations induced by charging effects and the dissipation. The quantum-mechanical partition function expressed in terms of phase slips in space-time can be mapped onto that of a two-dimensional Coulomb gas. Due to the dissipation the interaction is anisotropic. Despite the simplicity of the model, there is no general agreement about the phase diagram and the response functions. We have performed Monte Carlo simulations to determine the zero-temperature phase boundaries. We find four phases with the absence or presence of global or local order, in all combinations. We discuss the response functions in the different phases and find interesting transport properties.