Phase dynamics of two parallel stacks of coupled Josephson junctions

Abstract

Two parallel stacks of coupled Josephson junctions (JJs) are investigated to clarify the physics of transitions between the rotating and oscillating states and their effect on the IV-characteristics of the system. The detailed study of phase dynamics and bias dependence of the superconducting and diffusion currents allows one to explain all features of simulated IV-characteristics and demonstrate the correspondence in their behavior. The coupling between JJ in the stacks leads to the branching of IV-characteristics and a decrease in the hysteretic region. The crucial role of the diffusion current in the formation of the IV-characteristic of the parallel stacks of coupled JJs is demonstrated. We discuss the effect of symmetry in a number of junctions in the stacks and show a decrease of the branching in the symmetrical stacks. The observed effects might be useful for development of superconducting electronic devices based on intrinsic JJs.

Circuit models of simultaneously biased intrinsic Josephson junction stacks for terahertz radiations in high-bias regime

“…[12][13][14][15][16] It is noted that the terahertz radiation from an IJJ stack to the external space has been discussed using a resistively and capacitively shunted junction (RCSJ) array shunted by an LCR resonant circuit with respect to radiation phenomena. 17,18) Furthermore, the experimental current-voltage characteristics of parallelly-connected two IJJ stacks have been numerically reproduced by taking the temperature increase for parallely-connected two RCSJ circuits into account. 19) In this letter, we suggest an electric circuit model describing a JPE with two IJJ stacks, the superconducting single-crystal substrate connecting them, and the measurement circuit.…”

Electrothermal behavior and terahertz emission properties of a planar array of two Bi2Sr2CaCu2O8+δintrinsic Josephson junction stacks

“…In none of the arrangements of the two stacks we observed synchronized radiation, despite of the presence of interaction by the mutually impinging THz fields, by electrical currents in the superconducting electrodes or by a shared hot spot serving as a common, distributed load.At least some theoretical calculations indicated that two stacks connected in parallel, like our arrangement after the first FIB cut, should be synchronized [47,49]. Obviously, an additional synchronization mechanism, as the cavity resonance within a single stack, seems to be necessary.…”

Terahertz-wave emission from Bi2212 intrinsic Josephson junctions: a review on recent progress

“…This system has been discussed for more than 20 years [54] as a model of various synchronization phenomena found in nature and society [55]. The detailed mechanism of excitation of synchronised transverse Josephson plasma waves is thoroughly explained in previous review articles [53,56] and more recent papers [57,58,59,60,61]. The Josephson plasma frequency ω p can be measured using the Josephson plasma resonance in the long-wavelength limit by applying a uniform AC electric field along the c-axis over the ab-plane [16,62].…”

“…This system has been discussed for more than 20 years [54] as a model of various synchronisation phenomena found in nature and society [55]. The detailed mechanism of excitation of synchronised transverse Josephson plasma waves is thoroughly explained in previous review articles [53,56] and more recent papers [57][58][59][60][61].…”