3D wavefunctions

12 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

In quantum mechanics the time-independent Schrodinger's equation can be solved for eigenfunctions (also called eigenstates or wave-functions) and corresponding eigenenergies (or energy levels) for a stationary physical system. The wavefunction itself can take on negative and positive values and …

Band Structure Lab Demonstration: Bulk Strain

12 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck

This video shows an electronic structure calculation of bulk Si using Band Structure Lab. Several powerful features of this tool are demonstrated.

Buckyball C60

16 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

A fullerene is any molecule composed entirely of carbon, and can take the form of hollow spheres, ellipsoids, or tubes. Spherical fullerenes (often referred to as "buckyballs") are one of the known structurally different form of carbon. C60 are the most common of buckyball structures. …

Carbon nanotube bandstructure

22 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Carbon nanotubes are allotropes of carbon with a cylindrical nanostructure, and can be categorized into single-walled nanotubes (SWNT) and multi-walled nanotubes (MWNT). These cylindrical carbon molecules have novel properties that make them potentially useful in many nanotechnology applications, …

Crystal Viewer Demonstration: Bravais Lattices

12 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the exploration of several crystal structures using the Crystal Viewer tool. Several powerful features of this tool are demonstrated.

Crystal Viewer Demonstration: Bravais Lattices 2

12 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the exploration of several crystal structures using the Crystal Viewer tool. Several powerful features of this tool are demonstrated

Crystal Viewer Demonstration: Various Crystal Systems

12 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the use of the Crystal Viewer Tool to visualize several crystal systems, including Si, GaAs, C60 Buckyball, and a carbon nanotube. Crystal systems are rotated in 3D, zoomed in and out, and the lattice style changes from sticks and balls to lines to spheres.

CV profile with different oxide thickness

20 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

C-V (or capacitance-voltage) profiling refers to a technique used for the characterization of semiconductor materials and devices. C-V testing is often used during the characterization process to determine semiconductor parameters, particularly in MOSCAP and MOSFET structures. C-V measurements …

Diffusion of holes and electrons

15 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Diffusion is a process of particles distributing themselves from regions of high- to low- concentrations. In semi-classical electronics these particles are the charge carriers (electrons and holes). The rate at which a carrier can diffuse is called diffusion constant with units of cm2/s. The image …

Electron Density in a Nanowire

30 Jan 2011 | Animations | Contributor(s): Gerhard Klimeck, Saumitra Raj Mehrotra

Electron Density in a circular Silicon nanowire transistor.

Electronic band structure

12 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

In solid-state physics, the electronic band structure (or simply band structure) of a solid describes ranges of energy in which an electron is "forbidden" or "allowed". The band structure is also often called the dispersion or the E(k) relationship. It is a mathematical relationship between the …

Fermi-Dirac statistics with temperature

15 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Fermi-Dirac statistics is applied to identical particles with half-integer spin (such as electrons) in a system that is in thermal equilibrium. Since particles are assumed to have negligible mutual interactions, this allows a multi-particle system to be described in terms of single-particle energy …

Graphene nanoribbon bandstructure

17 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Graphene nanoribbons (often abbreviated as GNR) are planar strips of graphene with a thickness of approximately one atom. Carbon atoms in graphene are sp2-hybridized with a carbon-carbon bond length of approximately 0.142 nm. As an electronic material, graphene exhibits many desirable properties, …

Graphite

17 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

Graphene is a one-atom-thick planar sheet of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice. Graphene sheets are weakly bonded to other graphene layers above and below to form Graphite. The difference between two layers is approximately 0.335 nm [1]. Graphite can …

Local density of states

17 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

The concept of general density of states (DOS) in devices is, by definition, spatially invariant. However, in the case of inhomogeneous materials or in quantum confined structures, the density of states can be resolved in space. This is known as local density of states, or LDOS. …

MOSCap Demonstration: MOS Capacitor Simulation

11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation of a MOS capacitor using the MOSCAP tool. Several powerful analytic features of this tool are demonstrated.

MOSFet Demonstration: MOSFET Device Simulation and Analysis

11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation and analysis of a MOSFET device using the MOSFet tool. Several powerful analytic features of this tool are demonstrated.

OMEN Nanowire Demonstration: Nanowire Simulation and Analysis

11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation and analysis of a nanowire using OMEN Nanowire. Several powerful analytic features of this tool are demonstrated.

Periodic Potential Lab Demonstration: Standard Kroenig-Penney Model

11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation of a 1D square well using the Periodic Potential Lab. The calculated output includes plots of the allowed energybands, a table of the band edges and band gaps, plots of reduced and expanded dispersion relations, and plots comparing the dispersion relations to …

Piece-Wise Constant Potential Barriers Tool Demonstration: Bandstructure Formation with Finite Superlattices

11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation and analysis of a systems with a series of potential barriers. Several powerful analytic features of Piece-wise Constant Potential Barrier Tool (PCPBT) are demonstrated.

PN junction in forward bias

17 Apr 2010 | Animations | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

A PN junction is formed by joining p-type and n-type doped semiconductors together in very close contact. The p- and n-type semiconductors are conducting because of the available free carriers. However, because the carriers diffuse into the adjoining p and n regions by a process called …

PN Junction Lab Demonstration: Asymmetric PN Junctions

11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation and analysis of a several PN junctions using PN Junction Lab, which is powered by PADRE. Several powerful analytic features of this tool are demonstrated.

Quantum Dot Lab Demonstration: Pyramidal Qdots

11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

This video shows the simulation and analysis of a pyramid-shaped quantum dot using Quantum Dot Lab. Several powerful analytic features of this tool are demonstrated.

Quantum Dot Wave Function (Quantum Dot Lab)

02 Feb 2011 | Animations | Contributor(s): Gerhard Klimeck, David S. Ebert, Wei Qiao

Electron density of an artificial atom. The animation sequence shows various electronic states in an Indium Arsenide (InAs)/Gallium Arsenide (GaAs) self-assembled quantum dot.