Nowadays, most communication networks such as local area networks (LANs), metropolitan area networks (MANs), and wide area networks (WANs) have replaced or are about to replace coaxial cable or twisted copper wire with fiber optical cables. Light-wave communication systems comprise a transmitter based on a visible or near-infrared light source, whose carrier is modulated by the information sign...

The auth6rs have applied a simple modelling approach for multiple resonant tunnelling transistors (mRTTs) which includes four resonant tunnelling diodes (RTDs) within the transistor structure. Unique features of this model, corresponding to device features compatible for integrated circuits, allow for tuning and matching the devices for optimum circuit performance. Two circuits are presented fo...

Charge and potential profiles are self-consistently calculated in double-barrier heterostmctures to derive the capacitance of resonant tunnelling devices. We show that the dipole charge integrated over the accumulation or the depletion side of the device is the result of a complex arrangement of the mobile charge dragged and drifted when a bias is applied. Excellent agreement is found with capa...

We recently investigated the nature of resonant tunnelling in standard scalar Quantum Field Theory, uncovering the conditions required for resonance. It was shown that whereas the homogeneous false vacuum may decay via bubble nucleation, it may not decay in a resonant fashion. The no-go theorem given there is circumvented in this study by considering an initial state other than the homogeneous ...

In this paper an efficient high step-up converter with a coupled- inductor with soft- switching operation is presented. The proposed topology includes a coupled-inductor boost converter for raising the voltage gain. Moreover, a simple auxiliary resonant circuit composed of an auxiliary switch, a clamping diode and a resonant tank (inductor, capacitor), is adopted in this paper. The coupled-indu...

The design of a I-input and a ?-input 4-valued logic gate is described. These gatcs can be used to implement cells of a gate array, with the benefit of having prograrnriiabk functionality and multiple-valued logic input and output lincs. Programmable fimctionality allows any or the four billion functions of a '-input 4-valued logic gate to be implemented by thc samc cell, and multiplc-valucd hg...

Noise can be a unique probe of electron–electron correlations in nanoscale electron devices. While stationary or small signal transport can often be simply understood in terms of single particle behaviour, noise can be extremely sensitive to many-body effects (Landauer L 1996 Physica B 227 156). We present a new collective phenomenon emerging in electron transport in a resonant tunnelling diode...

In the resonant tunnelling diode we have treated electrons as non interacting particles. We have discussed their wave nature, which led to quantized energy states in small and coherent cavities. Qualitatively this is due to the requirement that an integer number of Fermi wavelengths has to fit between the barriers. Here we begin in the opposite limit by neglecting space quantization effects in ...