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In this paper, we recast the problem of interaction between a classical electromagnetic field and a pair of quantum dots coupled through dipoledipole interaction in terms of an equivalent circuit model. Then, we use the introduced circuit to investigate the electromagnetic scattering from a pair of interacting quantum dots. Equivalent circuits for complex systems of quantum dots greatly simplify the...
This paper presents an efficient technique to evaluate the scattering in the near field zone, based on the Dirichlet-to-Neumann map. Such a map allow to truncate the computational domain from an infinite one to a finite one. Specifically, it introduces an exact boundary condition on the truncated computational domain rather then an approximate one as it happens when using classical absorbing boundary...
This paper presents a performance analysis of Power Delivery Networks (PDNs) with innovative carbon-based materials, such as carbon nanotubes and graphene nanoribbons. The electrical and thermal performances of such PDNs are described in terms of voltage drop and temperature rise, respectively. The performance analysis is carried out by efficiently solving an electrothermal model, where the electrical...
This paper demonstrates the possibility of obtaining interconnects with negative derivative of the electrical resistance with respect to temperature. The interconnect is made of multi-walled carbon nanotube, and is fabricated by self-assembly through a low-cost bottom-up technique. The results of an electro-thermal characterization demonstrate the possibility of obtaining a negative temperature coefficient...
The paper investigates the possibility or realizing a low-cost gas sensor based on graphene. The gas sensor is realized by means of a microstrip-like circuit where the sensing area is a gap between two copper electrodes, filled by few layer graphene nanoplatelets. Graphene nanoplatelets are here obtained through a solvent-free procedure, from thermal expansion of intercalated graphite, followed by...
Among many outstanding properties of carbon-based interconnects, it is of great interest for nanoelectronics applications the possibility to have an electrical resistance almost insensitive or even decreasing with temperature increase. This behavior has been theoretically predicted and experimentally proven for carbon nanotubes and graphene nanoribbons, but only in controlled conditions, and for limited...
This paper presents an equivalent self-consistent electrothermal circuit model for power integrity analysis of large on-chip power distribution networks. Two coupled circuits are used to co-simulate the electrical and thermal behavior of the power grid. After a steady-state analysis, the order of the circuit is strongly reduced by means of a node clustering technique. The obtained low-order circuit...
This paper demonstrates the realization of an easy to manufacture graphene device with a low-cost and solvent-free procedure. Few layer graphene in the form of nanoplatelets is obtained from thermal expansion of intercalated graphite, followed by sonication. The graphene is then used to create an electrical contact between two copper electrodes in a microstrip-like circuit. The contact is self-assembled...
The concept of electromagnetic crosstalk in nano-circuits via quantum entanglement between the elements is considered. Manifestation of this effect in electromagnetic compatibility (EMC) and a solution for for its suppression are discussed.
The paper proposes a new homogenization technique for electrical interconnects embedded in inhomogeneous dielectrics, based on the properties of the matrices of the transmission line model. In particular, the Monotonicity property of the capacitance matrix with respect to the permittivity allows establishing a relation between the eigenvalues of the original problem and those of the equivalent homogeneous...
This paper proposes a realization of an easy to manufacture graphene device with a low-cost and solvent-free procedure. It is obtained by depositing few layer graphene in a gap between to electrodes in a microstrip-like circuit. The device is characterized in DC at room temperature, and the results show a satisfactory stability of its electrical resistance, thus demonstrating the reliability of the...
This paper introduces the concept of equivalent electrical multiport for a quantum device made of a pair of two-level objects, coupled via entanglement. The coupled pair is described in terms of an equivalent 2×2 admittance matrix, derived from the theory of the generalized susceptibility. This result provides a valuable tool to analyze quantum circuits in the frame of the classical circuit theory...
This paper presents the electrothermal analysis of the performances of a Power Delivery Network for nanoscale integrated circuits, comparing standard (copper) with carbon nanotubes and graphene interconnects. Realistic carbon interconnects are considered, with the typical values of electrical and thermal parameters obtainable with the current fabrication technology. A temperature-dependent model for...
This paper presents a new technique to lower the computational cost of the electrothermal (ET) analysis of a large on-chip power distribution network. It is based on a node reduction strategy following a preliminary efficient steady-state solution of the ET problem. After a proper classification of nodes according to temperature and voltage drop ranges, a reduced network is then produced by means...
This paper provides a transmission line (TL) model for the propagation of electric signals along graphene nanoribbon and carbon nanotubes interconnects in the sub-terahertz frequency range. The electrical parameters are written in terms of classical terms and quantum ones. The peculiar behavior of these parameters as a function of the transverse size and of the temperature is investigated, as well...
A general transmission line model is presented, able to describe a large class of nano-interconnects, made either by conventional metallic nanowires or by innovative carbon materials (carbon nanotubes or graphene nanoribbons). A common frame is presented here, which allows describing the electrodynamics of such nano-structures by means of a modified Boltzmann transport equation. This model leads to...
Inclusion of planar layered media Green's Functions (GFs) is a major issue in the computational efficiency of full-wave models derived from integral formulations. These GFs may be decomposed into quasi-dynamic and dynamic terms. In a wide range of practical applications, the quasi-dynamic terms may be given in closed form. This paper proposes two criteria to establish when the complete GFs may be...
The paper investigates the Signal Integrity performance of innovative on-chip interconnects made by carbon-based materials, such as Carbon Nanotubes (CNTs) and Graphene NanoRibbons (GNRs). The innovative solutions are compared to the conventional copper realization. A simple but physically meaningful equivalent circuital model is presented for these interconnects, which properly accounts for the quantistic...
A parallel computation approach based on the properties of the Graphics Processor Units (GPU) is here presented to speed-up the broadband modeling of passive 3D structures. The full-wave electromagnetic model is based on a surface integral formulation, numerically implemented by using a null-pinv decomposition of the unknowns. The numerical model has been proven to be accurate and well-posed for a...
This paper analyzes the radiated emissions of a system consisting of an IC (a Flash memory device) and its package (PQFP80). The system is described by means of an IC emission model (ICEM). The radiated emissions are estimated by means of an electromagnetic model for the field emissions of current loops. Experimental characterization was conducted to measure the currents on the package and the far-field...
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