JOPSS - Search Results

Observing the teraherz radiation emission from Bi $_{2}$ Sr $_{2}$ CaCuO $_{8}$ leads to a number of the experimental and theoretical studies of revealing the mechanism of the behaviors in superconducting engineering. We develop a large-scale simulation approach for the teraherz emission from intrinsic Josephson junction stacks with multiple spatial scales. We focus on the effects of the number of the junctions in the system, which is considered to be a key ingredient of determining the emission-power bound. Our simulation method successfully predicts the amplification of the emission peaks corresponding to the fundamental mode, i.e., a primary contribution in low-current-biased region.

Oral presentation

Layer-number-dependence of teraherz radiations from intrinsic Josephson junctions stacks

Ota, Yukihiro; Machida, Masahiko

no journal, ,

Since the observation of teraherz emission from mesas made of layered high-Tc superconductor BiSrCaCuO, the mechanism of radiation attracts a great deal of attention from theoretical and engineering points of view. Emission has a connection with the dynamical aspects of superconducting phases and electromagnetic wave; constructing a theoretical approach to integrating these degrees of freedom is desirable. A way to resolving the issues is built up by 3D dynamical simulations of intrinsic Josephson junction stacks with outside-vacuum contributions. In this article, we apply our code to characterizing teraherz emission in low-bias-current regions. The highlight is to achieve the change of the junction numbers involved the sample. We successfully reproduce the emergence of -kink behaviors. Then, we show the presence of a critical value of the number of junctions for a strong emission.

Presentation/Publication Type

Journal/Book Title

Meeting title

First Author

Keyword

Language

Publication Year

Held year of conference

Half-integer Shapiro-steps in superconducting qubit with a -Josephson junction

Unified theory for magnetic and electric field coupling in multistacked Josephson junctions

Localized rotating-modes in capacitively coupled intrinsic Josephson junctions; Systematic study of branching structure and collective dynamical instability

Josephson vortex flow and plasma amplification in high-Tc superconductors

Frequency characteristics of multiple Josephson junctions

Collective dynamics of Josephson vortices in intrinsic Josephson junctions; Exploration of in-phase locked superradiant vortex flow states

Dynamical breaking of charge neutrality in intrinsic Josephson junctions; Common origin for microwave resonant absorptions and multiple-branch structures in I-V characteristics

Numerical simulations of terahertz emission from intrinsic Josephson junctions with variation of the number of junctions

Layer-number-dependence of teraherz radiations from intrinsic Josephson junctions stacks