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Lecture 4: The ab-initio Wigner Monte Carlo Method
18 Nov 2014 | | Contributor(s):: Jean Michel D Sellier
In this lecture, Dr. Sellier discusses the ab-initio Wigner Monte Carlo method for the simulation of strongly correlated systems.
IMA 2013 UQ: DFT-based Thermal Properties: Three Levels of Error Management
02 Apr 2014 | | Contributor(s):: Kurt Lejaeghere
It is often computationally expensive to predict finite-temperature properties of a crystal from density-functional theory (DFT). The temperature-dependent thermal expansion coefficient α, for example, is calculated from the phonon spectrum, and the melting temperature Tm can only be obtained...
Tutorial 1: Atomistic Material Science - ab initio simulations of materials
03 Nov 2011 | | Contributor(s):: Alejandro Strachan
This lecture introduces first principles electronic structure calculations of materials properties.It describes the approximations made to the many-body Schrodinger equation in Hartree Fock and Density Functional Theory and numerical approximations used in computer simulations.
OPV: Time Domain Ab Initio Studies of Organic-Inorganic Composites for Solar Cells
31 Jan 2011 | | Contributor(s):: Oleg Prezhdo
This presentation was part of the "Organic Photovoltaics: Experiment and Theory" workshop at the 2010 Users' Meeting of the Molecular Foundry and the National Center for Electron Microscopy, both DOE-funded Research Centers at Lawrence Berkeley National Laboratory.
OPV: Large Scale Ab Initio Simulation for Charge Transport in Disordered Organic Systems
31 Jan 2011 | | Contributor(s):: Lin-Wang Wang
Tutorial 3b: Materials Simulation by First-Principles Density Functional Theory II
14 Sep 2010 | | Contributor(s):: Umesh V. Waghmare
Ripples and Warping of Graphene: A Theoretical Study
08 Jun 2010 | | Contributor(s):: Umesh V. Waghmare
We use first-principles density functional theory based analysis to understand formation of ripples in graphene and related 2-D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wave-lengths. Many...
MSE 597G Lecture 6: Interatomic potentials III
out of 5 stars
12 Nov 2008 | | Contributor(s):: Alejandro Strachan
Reactive force fields,Parameterization of interatomic potentials
BNC Annual Research Review: An Introduction to PRISM and MEMS Simulation
04 Jun 2008 | | Contributor(s):: Jayathi Murthy
This presentation is part of a collection of presentations describing the projects, people, and capabilities enhanced by research performed in the Birck Center, and a look at plans for the upcoming year.
Dynamics of Quantum Fluids: Path integral and Semiclassical Methods
21 May 2008 | | Contributor(s):: Nancy Makri
The interplay of many-body nonlinear interactions and quantum mechanical effects such as zero-point motion or identical particle exchange symmetries lead to intriguing phenomena in low-temperature fluids, some of which remain poorly understood. Recent advances in theory and methodology have...
"Ab Initio" Theory of Novel Micro and Nanolasers
19 May 2008 | | Contributor(s):: A. Douglas Stone
While the laser is one of the most important inventions of the past century and one of the most interesting and controllable non-linear systems in physics, there is surprisingly little predictive theory of lasing properties. Predicting lasing thresholds and output power far above threshold in the...
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...
Exploring Physical and Chemical control of molecular conductance: A computational study
31 Jan 2008 | | Contributor(s):: Barry D. Dunietz
Dynamics on the Nanoscale: Time-domain ab initio studies of quantum dots, carbon nanotubes and molecule-semiconductor 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...
Finite Size Scaling and Quantum Criticality
02 Jan 2008 | | Contributor(s):: Sabre Kais
In statistical mechanics, the finite size scaling method provides a systematic way to extrapolate information about criticality obtained from a finite system to the thermodynamic limit. For quantum systems, the finite size corresponds not to the spatial dimension but to the number of elements in...
Excellence in Computer Simulation: Computational Materials
20 Dec 2007 | | Contributor(s):: Eric Schwegler
This presentation was one of 13 presentations in the one-day forum, "Excellence in Computer Simulation," which brought together a broad set of experts to reflect on the future of computational science and engineering.
Perspectives on Computational Quantum Chemistry
20 Dec 2007 | | Contributor(s):: Martin P. Head-Gordon
Computational Mathematics: Role, Impact, Challenges
20 Dec 2007 | | Contributor(s):: Juan C. Meza
MCW07 Electronic Level Alignment at Metal-Molecule Contacts with a GW Approach
05 Sep 2007 | | Contributor(s):: Jeffrey B. Neaton
Most recent theoretical studies of electron transport in single-molecule junctions rely on a Landauer approach, simplified to treat electron-electron interactions at a mean-field level within density functional theory (DFT). While this framework has proven relatively accurate for certain systems,...
MCW07 Modeling Charging-based Switching in Molecular Transport Junctions
23 Aug 2007 | | Contributor(s):: Sina Yeganeh, Misha Galperin, Mark Ratner
We will discuss several proposed explanations for the switching and negative differential resistance behavior seen in some molecular junctions. It is shown that a proposed polaron model is successful in predicting both hysteresis and NDR behavior, and the model is elaborated with image charge...