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电阻电容分路的约瑟夫森结中阵发性混沌及混沌控制的计算机模拟 总被引:1,自引:1,他引:1
通过计算机模拟研究了电阻电容分路的约瑟夫森结中的混沌行为,给出了结电压随阻尼参数及偏置直流电流变化的分岔图,从而展示了混沌产生的方式及混沌出现的参数区间,并基于弱周期扰动理论提出了控制RCSJJ中混沌的方案,模拟结果证明了该方案的有效性. 相似文献
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我们开展了高临界电流密度的NbN约瑟夫森结的制备和特性研究.利用直流磁控溅射方法在单晶MgO(100)衬底上外延生长NbN/AlN/NbN三层膜,并使用微加工工艺制备了NbN约瑟夫森隧道结,在液氦温度下对NbN约瑟夫森结的电流-电压特性进行了测量,实验结果表明,NbN约瑟夫森结具有良好的隧穿特性,其临界电流密度J_c为10 kA/cm^2,质量因子大于10,能隙是5.7 mV,这些实验结果为基于NbN结的超导数字电路研究奠定了坚实的基础. 相似文献
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约瑟夫森结是一种利用超导材料制备的新型量子电子器件,它的一个显著特性是具有高度的非线性,因而会出现明显的混沌行为。约瑟夫森结与阵列的混沌行为具有重要的研究和应用价值,受到了广泛的关注。文中对约瑟夫森结与阵列的非线性混沌行为及研究进展做一些介绍。 相似文献
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高温超导约瑟夫森结阵列的相位锁定 总被引:1,自引:0,他引:1
根据交流约瑟夫森效应,研究了嵌入Fabry-Perot谐振腔里的约瑟夫森结阵列在微波辐照下的相位锁定问题。结阵列是由生长在双晶钇稳定氧化锆(YSZ)基片上的YB2Cu3O7(YBCO)超导薄膜光刻成微桥得到的。通过优化设计,在温度为79.2K辐照频率为77.465GHz的条件下,包含620个串联约瑟夫森双晶结的结阵列在外加微波辐照下实现了相位锁定,得到了陡峭的夏皮罗台阶。其第一级夏皮罗台阶的电压约为0.1V,台阶高度约为0.17mA。试验结果表明,这种结阵列结构在电压基准的应用上有极大的优势,而且这种准光学耦合方法在太赫兹信号发生和检测方面有很好的应用前景。 相似文献
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高温超导约瑟夫森结技术近年来发展很快,特别是台阶结、双晶结、双外延结、边缘结和邻近效应结等性能已达到实用水平,并应用于超导量子干涉器件、数字信号处理和高频有源器件中。文章介绍了这些结的技术和有关的应用。 相似文献
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高温超导约瑟夫森结技术近年来发展很快,特别是台阶结、双晶结、双外延结、边缘结和邻近效应结等性能已达到实用水平,并应用于超导量子干涉器件、数字信号处理和高频有源器件中。文章介绍了这些结的技术和有关的应用。 相似文献
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垫圈是与螺栓、螺母配套使用的金工零件.试想,将三个大小相同的垫圈叠在一起:两个超导Nb垫圈,中间夹一个极薄的绝缘垫圈(AJOx),便构成了一个环形约瑟夫森结.最近,来自德国爱尔兰根一纽伦堡大学的wallraff等研究了这样一种“长约瑟夫森结”中的涡流动力学特性.结果表明,这类涡旋有可能成为未来量子计算中量子比特的候选者. 相似文献
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基于Sakai-Bodin-Petersen理论,我们求解了对称的双约瑟夫森结的耦合非线性方程组.结果表明,线性化方程组的同相和反相解所对应的两种磁通运动模式也存在于原始的非线性方程组的解中,同时非线性方程组独有的位相锁定的扭折(kinks)形式的磁通运动在低能情况下会演化为孤子解. 相似文献
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The fluctuation power spectrum of the Josephson junction has been evaluated in the limit of large energy barriers [(U
n
max−U
n
min)γ]≫1 and small currents [x≪x
e]. The result is valid for finite capacitance of the junction. The effect of the fluctuating Josephson current on the voltageV(t) across the junction has also been taken into account. 相似文献
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<正>The anisotropy of the dc Josephson current in the superconducting junctions of the p-wave equal spin pairing symmetry is theoretically investigated by the Furusaki-Tsukada-like formula.The current phase relations exhibit different oscillation periods and different phase shifts for the current along different directions,respectively. 相似文献
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Symmetry restoring dynamics in a two-species bosonic Josephson junction by using occasional coupling
In this paper, by employing an occasionally coupling scheme in a two-species bosonic Josephson junction, it is found that for nonlocal measure synchronized states appearing in the two dynamic modes, known as 0-phase mode and π phase mode, their broken-symmetry can be restored.Nevertheless, there are dramatic differences for the results. For 0-phase mode, we can restore the broken symmetry by turning the nonlocal MS state into a conventional quasiperiodic MS state.However, for the π-phase mode, the broken symmetry is restored accompanied by the appearance of chaotic MS states. 相似文献
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We have measured the microwave characteristics of Josephson junction at liquid nitrogen temperature by using microwave network analyser. Based upon these experimental results we present a microwave circuit model of Josephson junction at liquid nitrogen temperature and calculate the parameters of microwave circuit model of Josephson junction. 相似文献
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The I-V characteristics of a Josephson junction shunted by an Ohmic resistor shows sharp peaks when levels in neighbouring wells are crossing. We consider the shape and size of these peaks using a double-well model where the wells are given in parabolic approximation. The friction of arbitrary strength is included by the help of a bath of infinitely many degrees of freedom. 74.50.+z. 相似文献