Nanoelectronic Modeling Lecture 20: NEGF in a Quasi-1D Formulation

27 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck, Samarth Agarwal, Zhengping Jiang

This lecture will introduce a spatial discretization scheme of the Schrödinger equation which represents a 1D heterostructure like a resonant tunneling diode with spatially varying band edges and effective masses.

Nanoelectronic Modeling Lecture 09: Open 1D Systems - Reflection at and Transmission over 1 Step

25 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck, Dragica Vasileska, Samarth Agarwal

One of the most elemental quantum mechanical transport problems is the solution of the time independent Schrödinger equation in a one-dimensional system where one of the two half spaces has a higher potential energy than the other. The analytical solution is readily obtained using a scattering …

Nanoelectronic Modeling Lecture 11: Open 1D Systems - The Transfer Matrix Method

31 Dec 2009 | Online Presentations | Contributor(s): Gerhard Klimeck, Dragica Vasileska, Samarth Agarwal, Parijat Sengupta

The transfer matrix approach is analytically exact, and “arbitrary” heterostructures can apparently be handled through the discretization of potential changes. The approach appears to be quite appealing. However, the approach is inherently unstable for realistically extended devices which …

Nanoelectronic Modeling Lecture 10: Open 1D Systems - Transmission through & over 1 Barrier

31 Dec 2009 | Online Presentations | Contributor(s): Gerhard Klimeck, Dragica Vasileska, Samarth Agarwal

Tunneling and interference are critical in the understanding of quantum mechanical systems. The 1D time independent Schrödinger equation can be easily solved analytically in a scattering matrix approach for a system of a single potential barrier. The solution is obtained by matching wavefunction …

Comparison of PCPBT Lab and Periodic Potential Lab

10 Aug 2009 | Online Presentations | Contributor(s): Abhijeet Paul, Samarth Agarwal, Gerhard Klimeck, Junzhe Geng

This small presentation provides information about the comparison performed for quantum wells made of GaAs and InAs in two different tools. This has been done to benchmark the results from completely two different sets of tools and validate the obtained results. In this presentation we provide the …

Resonant Tunneling Diode Simulation with NEGF: First-Time User Guide

01 Jun 2009 | Teaching Materials | Contributor(s): Samarth Agarwal, Gerhard Klimeck

This first-time user guide for Resonant Tunneling Diode Simulation with NEGF provides some fundamental concepts regarding RTDs along with details on how device geometry and simulation parameters influence current and charge distribution inside the device. NCN@Purdue

Piece-Wise Constant Potential Barriers Tool: First-Time User Guide

01 Jun 2009 | Teaching Materials | Contributor(s): Samarth Agarwal, Gerhard Klimeck

This supporting document for the Piece-Wise Constant Potential Barriers Tool serves as a first-time user guide. Some basic ideas about quantum mechanical tunneling are introduced in addition to how device geometry influences tunneling probability. The transfer matrix and tight-binding formulations …

Resonant Tunneling Diode Simulation with NEGF

18 Aug 2008 | Tools | Contributor(s): Hong-Hyun Park, Zhengping Jiang, Arun Goud Akkala, Sebastian Steiger, Michael Povolotskyi, Tillmann Christoph Kubis, Jean Michel D Sellier, Yaohua Tan, SungGeun Kim, Mathieu Luisier, Samarth Agarwal, Michael McLennan, Gerhard Klimeck, Junzhe Geng

Simulate 1D RTDs using NEGF.

1D Heterostructure Tool

04 Aug 2008 | Tools | Contributor(s): Arun Goud Akkala, Sebastian Steiger, Jean Michel D Sellier, Sunhee Lee, Michael Povolotskyi, Tillmann Christoph Kubis, Hong-Hyun Park, Samarth Agarwal, Gerhard Klimeck

Poisson-Schrödinger Solver for 1D Heterostructures

Piece-Wise Constant Potential Barriers Tool

30 Jun 2008 | Tools | Contributor(s): Xufeng Wang, Samarth Agarwal, Gerhard Klimeck, Dragica Vasileska, Mathieu Luisier, Jean Michel D Sellier

Transmission and the reflection coefficient of a five, seven, nine, eleven and 2n-segment piece-wise constant potential energy profile