The single-electron-tunneling (SET) effect in a nanoscale granular microbridge, which consists of a two-dimensional array of small intergrain tunnel junctions, was investigated. We observed the Coulomb blockade effect...
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The single-electron-tunneling (SET) effect in a nanoscale granular microbridge, which consists of a two-dimensional array of small intergrain tunnel junctions, was investigated. We observed the Coulomb blockade effect and the periodic electrical field effect in the microbridges. These results coincide well with results of numerical calculations based on a model of a two-dimensional SET junction array. We shelved that electron conduction properties of the microbridges are quasi-zero-dimensional, because the size of the charge soliton is larger than the dimensions of the microbridges. The details of the current-voltage characteristics were considered as an aspect of the Kosterlitz-Thouless (KT) transition, which is a peculiar phase transition in a two dimensional system. The electron conduction properties are extremely affected by the existence of a fixed background charge.
This paper presents simulation results on a 2-darray of coupled Chua's circuits called a chaotic Cellular Neural Network (CNN) in [1], but here will be called an f(z) - x coupled chaotic CNN in order to distingui...
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This paper presents simulation results on a 2-darray of coupled Chua's circuits called a chaotic Cellular Neural Network (CNN) in [1], but here will be called an f(z) - x coupled chaotic CNN in order to distinguish it from other recently proposed chaotic CNN architectures [2]-[4], Each isolated cell with unity self-feedback in the network is a Chua's circuit and is connected only to its nearest neighbors defined by a metric and a neighborhood size [1], [5]. The network is designed with a 2-d torus like connection topology having cyclic boundary conditions that play an important role in complete phase syncronization. It is observed in our computer simulations that i) depending on the choice of the intracell parameters and the connection weights, the cells of the network appear to be operating in a double-scroll Chua's attractor, in spiral Chua's attractors, in stable equilibria, in a period-1, a period-2, a large limit-cycle, or in a large chaotic regime, ii) complete phase synchronization in the network with all cells operating in the double scroll regime can be obtained by a suitable choice of the intracell parameters and the feedback connection weights, iii) there is a set of the intracell parameters and connection weights resulting in a chaotic regime such that each cell depending on its constant external input falls into one of the three attractors;namely, the double-scroll, P+ spiral, or P- spiral Chua's attractor. As a new phenomenon, a close relation between phase synchronization settling-time and input pattern is observed that offers new potentials of Chua's circuit arrays for pattern recognition applications.
A novel and simple scheme used to achieve a 2-darray of monolithic multiple wavelength lasers is reported. Uniformly separated wavelengths are emitted from an eight-element linear array and an 8*8 2d array of surface...
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A novel and simple scheme used to achieve a 2-darray of monolithic multiple wavelength lasers is reported. Uniformly separated wavelengths are emitted from an eight-element linear array and an 8*8 2d array of surface emitting lasers in the 950 nm regime. The lasers all have nearly identical light against current characteristics.
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