
ABINIT: FirstTime User Guide
09 Jun 2009   Contributor(s):: Benjamin P Haley
This firsttime user guide provides an introduction to using ABINIT on nanoHUB. We include a very brief summary of Density Functional Theory along with a tour of the Rappture interface. We discuss the default simulation (what happens if you don't change any inputs, and just hit "simulate") as...

Atomistic Simulations of Materials Chemistry: From Nanoelectronics to Energetics
07 Apr 2015   Contributor(s):: Alejandro Strachan
Presentation slides with embedded videos are available for download. Please see the Support Docs tab.

Calculating Resonances Using a Complex Absorbing Potential
13 Mar 2008   Contributor(s):: Robin Santra
The Siegert (or Gamow) wave function associated with a resonance state is exponentially divergent at large distances from the scattering target. A complex absorbing potential (CAP) provides a computationally simple and efficient technique for calculating the complex Siegert energy of a resonance...

Chemistry of Transition Metal Alloy Nanoparticles with Desired Phase Properties
20 Jun 2011   Contributor(s):: Lichang Wang
In this presentation, I will discuss the results of two alloy nanoparticles, PtAu and PtVFe. I will also present the synergetic results of unraveling PtVFe nanoparticles by coupling computational chemistry with experimental work.

CNDO/INDO
09 Oct 2007   Contributor(s):: Baudilio Tejerina, Jeff Reimers
Semiempirical Molecular Orbital calculations.

Computational Mathematics: Role, Impact, Challenges
20 Dec 2007   Contributor(s):: Juan C. Meza
This presentation was one of 13 presentations in the oneday forum, "Excellence in Computer Simulation," which brought together a broad set of experts to reflect on the future of computational science and engineering.

Computational Nanoscience, Lecture 20: Quantum Monte Carlo, part I
15 May 2008   Contributor(s):: Elif Ertekin, Jeffrey C Grossman
This lecture provides and introduction to Quantum Monte Carlo methods. We review the concept of electron correlation and introduce Variational Monte Carlo methods as an approach to going beyond the mean field approximation. We describe briefly the SlaterJastrow expansion of the wavefunction, and...

Computational Nanoscience, Lecture 21: Quantum Monte Carlo, part II
15 May 2008   Contributor(s):: Jeffrey C Grossman, Elif Ertekin
This is our second lecture in a series on Quantum Monte Carlo methods. We describe the Diffusion Monte Carlo approach here, in which the approximation to the solution is not restricted by choice of a functional form for the wavefunction. The DMC approach is explained, and the fixed node...

Computational Nanoscience, Lecture 4: Geometry Optimization and Seeing What You're Doing
13 Feb 2008   Contributor(s):: Jeffrey C Grossman, Elif Ertekin
In this lecture, we discuss various methods for finding the ground state structure of a given system by minimizing its energy. Derivative and nonderivative methods are discussed, as well as the importance of the starting guess and how to find or generate good initial structures. We also briefly...

Computational Nanoscience, PopQuiz
15 May 2008   Contributor(s):: Elif Ertekin, Jeffrey C Grossman
This quiz summarizes the most important concepts which have covered in class so far related to Molecular Dynamics, Classical Monte Carlo Methods, and Quantum Mechanical Methods.University of California, Berkeley

Computational Nanoscience, PopQuiz Solutions
15 May 2008   Contributor(s):: Elif Ertekin, Jeffrey C Grossman
The solutions to the popquiz are given in this handout.University of California, Berkeley

Dynamics of Quantum Fluids: Path integral and Semiclassical Methods
21 May 2008   Contributor(s):: Nancy Makri
The interplay of manybody nonlinear interactions and quantum mechanical effects such as zeropoint motion or identical particle exchange symmetries lead to intriguing phenomena in lowtemperature fluids, some of which remain poorly understood. Recent advances in theory and methodology have...

Dynamics on the Nanoscale: Timedomain ab initio studies of quantum dots, carbon nanotubes and moleculesemiconductor interfaces
31 Jan 2008   Contributor(s):: Oleg Prezhdo
Device miniaturization requires an understanding of the dynamical response of materials on the nanometer scale. A great deal of experimental and theoretical work has been devoted to characterizing the excitation, charge, spin, and vibrational dynamics in a variety of novel materials, including...

Energy and Nanoscience A More Perfect Union
27 Mar 2009   Contributor(s):: Mark Ratner
Huge problems of energy and sustainability confront the science/engineering community, mankind, and our planet. The energy problem comes in many dimensions, including supply, demand, conservation, transportation, and storage. This overview will stress the nature of these problems, and offer a few...

Excellence in Computer Simulation
19 Dec 2007   Contributor(s):: Mark Lundstrom, Jeffrey B. Neaton, Jeffrey C Grossman
Computational science is frequently labeled as a third branch of science  equal in standing with theory and experiment, and computational engineering is now an essential component of technology development and manufacturing. The successes of computational science and engineering (CSE) over the...

Exploring Physical and Chemical control of molecular conductance: A computational study
31 Jan 2008   Contributor(s):: Barry D. Dunietz

Facio
25 May 2008   Contributor(s):: Masahiko Suenaga
Facio is a 3Dgraphics program for molecular modeling and visualization of quantum chemical calculations(GAMESS and Gaussian).It is a GUI for FMO (Fragment MO) calculation. Selected features include:(1) From a PDB file, create GAMESS/FMO input with 4 mouse clicks.(2) Manual fragmentation for the...

Finite Size Scaling and Quantum Criticality
09 May 2007   Contributor(s):: Sabre Kais
The study of quantum phase transitions, which are driven by quantum fluctuations as a consequence of Heisenberg's uncertainty principle, continues to be of increasing interest in the fields of condensed matter and atomic and molecular physics. In this field we have established an analogy between...

Forces That Govern Life: On the Way to Understanding Intermolecular Interactions
20 Jul 2017   Contributor(s):: Lyudmila V. Slipchenko
This talk will overview our recent work on the Effective Fragment Potential (EFP) method. EFP is a model potential designed for describing noncovalent interactions. The absence of fitted parameters and a natural partitioning of the interaction energy into Coulomb, polarization, dispersion, and...

Ionic Selectivity in Channels: complex biology created by the balance of simple physics
05 Jun 2008   Contributor(s):: Bob Eisenberg
An important class of biological molecules—proteins called ionic channels—conduct ions (like Na+ , K+ , Ca2+ , and Cl− ) through a narrow tunnel of fixed charge (‘doping’). Ionic channels control the movement of electric charge and current across biological membranes and so play a role in biology...