A Single Electron Device and Circuit Simulator SIMON is a sophisticated multipurpose simulator for singleelectron devices and circuits. It features a graphical circuit editor embedded in a graphical user interface as well as the simulation of cotunnel events and a single step interactive analyses mode. It supports energy dependent density of states and is able to calculate stability plots. ■ Features of SIMON 2.0: STABILITY PLOT ★ traditional stability plot with two voltages as x and yaxis ★ one axis can be the temperature ★ one or both axis can be a capacitance or resistance ★ differentiation in x or y direction possible NORMAL RESISTORS ★ normal resistors allow the modeling of more complex and realistic circuits CURRENT SOURCES ★ current sources can be specified with a certain chargegranularity, which allows the modeling of electron injectors/pumps/turnstiles in a very easy manner ENERGY DEPENDENT DENSITY OF STATES ★ The tunnel model has been improved by incorporating three kinds of density of states functions ★ constant with optional bandgap (metallic) ★ squareroot with bandgap (semiconductorlike) ★ x/(x^{2}1)^{1/2} with bandgap (superconductorlike) ★ discrete energy levels are modeled as gaussian functions, with mean, width, and height. SUPPORT FOR SUPERCONDUCTING TUNNEL JUNCTIONS ★ quasiparticle tunneling FULL SUPPORT FOR LINUX ★ SIMON is shipped in a software package where all necessary libraries (tcl/tk) are wrapped into the application. Hence no need to install any 3rd party tools to run SIMON on Linux. The installation is as easy as copying a file into a subdirectory. EASY TO USE ★ simple automatic installation for Windows operating systems ★ graphical user interface ★ graphical circuit editor (drag and drop assembly of circuits; few mouse clicks and your circuit is assembled) ★ graphical visualization of simulation results (you can plot many graphs in one diagram; compare results from different simulations) COTUNNELING ★ cotunneling is simulated up to a user specified order ★ two different cotunnel simulation algorithms are available INTERACTIVE SINGLESTEP MODE ★ single electrons can be forced to tunnel through particular tunnel junctions in an interactive fashion ★ the system energy, all node voltages, and all node charges are updated automatically
