In quantum chemistry, n-electron valence state perturbation theory (NEVPT) is a perturbative treatment applicable to multireference CASCI-type wavefunctions. It can be considered as a generalization of the well-known second-order Møller–Plesset perturbation theory to multireference Complete Active Space cases. The theory is directly integrated into many quantum chemistry packages such as MOLCAS, , DALTON, PySCF and ORCA. The research performed into the development of this theory led to various implementations. The theory here presented refers to the deployment for the Single-State NEVPT, where the perturbative correction is applied to a single electronic state.Research implementations has been also developed for Quasi-Degenerate cases, where a set of electronic states undergo the perturbative correction at the same time, allowing interaction among themselves. The theory development makes use of the quasi-degenerate formalism by Lindgren and the Hamiltonian multipartitioning technique from Zaitsevskii and Malrieu. (Wikipedia).
Quantum Field Theory 4d - Second Quantization IV
We end our discussion of second quantization with the details of perturbation theory.
From playlist Quantum Field Theory
In this lecture we introduce the basic ideas of perturbation theory for interacting theories: the S-matrix, interaction picture, and Fermi's golden rule. We use this to calculate our first physical observable in a toy model.
From playlist UC Davis: Brief Overview of Relativistic Quantum Field Theory
Feynman Diagrams and Perturbation Theory: Calculating in Particle Physics
In this video, we talk about how physicists perform calculations in particle physics using perturbation theory and Feynman diagrams. We discuss what perturbation theory is, how it relates to Feynman diagrams, how to read Feynman diagrams and how one actually gets a mathematical result out
From playlist Standard Model
Quantum Field Theory 5a - Classical Electrodynamics I
In this video we look at two important results from classical electrodynamics that we will need in order to continue with our development of quantum electrodynamics. First is the problem of the electron "self-force." The pieces of a finite distribution of electric charge exert forces on
From playlist Quantum Field Theory
The 2n+1 Theorem | Perturbation Theory | Quantum Mechanics
In this video, we will explain the 2n+1 theorem and show you how to derive it. This theorem is useful when you want to calculate the energy of some system using perturbation theory, and has also found applications in density functional theory. References: [1] Baroni et al., "Phonons and
From playlist Quantum Mechanics, Quantum Field Theory
Quantum Field Theory 5b - Classical Electrodynamics II
[Reupload to correct color encoding issues] We complete our discussion of the electron self-force problem and introduce the concept of (classical) mass renormalization.
From playlist Quantum Field Theory
Mod-01 Lec-31 Microscopic (BCS) Theory of Superconductivity
Condensed Matter Physics by Prof. G. Rangarajan, Department of Physics, IIT Madras. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist NPTEL: Condensed Matter Physics - CosmoLearning.com Physics Course
OHM2013: Introduction to Quantum Perturbation
For more information visit: http://bit.ly/OHM13_web To download the video visit: http://bit.ly/OHM13_down Playlist OHM 2013: http://bit.ly/OHM13_pl Speaker: Karnei Gozman A birds eye view of the diagrammatic representation of Rayleigh-Schrödinger Perturbation Theory(RSPT), a general form
From playlist OHM 2013
Perturbation Theory in Quantum Mechanics - Cheat Sheet
In this video we present all the equations you need to know when you want to do time (in)dependent, (non-)degenerate perturbation theory in non-relativistic #QuantumMechanics References: [1] Sakurai, Napolitano, "Modern Quantum Mechanics". Table of Contents: 00:00 Introduction 00:57 T
From playlist Quantum Mechanics, Quantum Field Theory
Chao Yang - Low rank approximation in electron excitation calculations - IPAM at UCLA
Recorded 02 May 2022. Chao Yang of Lawrence Berkeley National Laboratory presents "Low rank approximation in electron excitation calculations" at IPAM's Large-Scale Certified Numerical Methods in Quantum Mechanics Workshop. Abstract: A practical way to study electron excitation computation
From playlist 2022 Large-Scale Certified Numerical Methods in Quantum Mechanics
Low-x phenomenology (LXPH - Lecture 2) by Raju Venugopalan
PROGRAM THE MYRIAD COLORFUL WAYS OF UNDERSTANDING EXTREME QCD MATTER ORGANIZERS: Ayan Mukhopadhyay, Sayantan Sharma and Ravindran V DATE: 01 April 2019 to 17 April 2019 VENUE: Ramanujan Lecture Hall, ICTS Bangalore Strongly interacting phases of QCD matter at extreme temperature and
From playlist The Myriad Colorful Ways of Understanding Extreme QCD Matter 2019
Stiefel Liquids: Possibly Non-Lagrangian Critical Spin Liquids by Yin-Chen He
PROGRAM FRUSTRATED METALS AND INSULATORS (HYBRID) ORGANIZERS Federico Becca (University of Trieste, Italy), Subhro Bhattacharjee (ICTS-TIFR, India), Yasir Iqbal (IIT Madras, India), Bella Lake (Helmholtz-Zentrum Berlin für Materialien und Energie, Germany), Yogesh Singh (IISER Mohali, In
From playlist FRUSTRATED METALS AND INSULATORS (HYBRID, 2022)
P Blaha - WIEN2k: methods and features
PROGRAM: STRONGLY CORRELATED SYSTEMS: FROM MODELS TO MATERIALS DATES: Monday 06 Jan, 2014 - Friday 17 Jan, 2014 VENUE: Department of Physics, IISc Campus, Bangalore PROGRAM LINK : http://www.icts.res.in/program/MTM2014 The realistic description of materials with strong electron-electro
From playlist Strongly correlated systems: From models to materials
Lec 8 | MIT 3.320 Atomistic Computer Modeling of Materials
Case Studies of DFT View the complete course at: http://ocw.mit.edu/3-320S05 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 3.320 Atomistic Computer Modeling of Materials
Lecture 09-Jack Simons Electronic Structure Theory- Metastable anions
Special tricks for studying metastable anions; variational collapse; virtual orbitals are difficult to identify- examples; long-range potentials and the centrifugal potential; valence and long-range components of the wave function; relation to electron scattering; charge stabilization meth
From playlist U of Utah: Jack Simons' Electronic Structure Theory course
Monomer Percolation by Kedar Damle
PROGRAM FRUSTRATED METALS AND INSULATORS (HYBRID) ORGANIZERS Federico Becca (University of Trieste, Italy), Subhro Bhattacharjee (ICTS-TIFR, India), Yasir Iqbal (IIT Madras, India), Bella Lake (Helmholtz-Zentrum Berlin für Materialien und Energie, Germany), Yogesh Singh (IISER Mohali, In
From playlist FRUSTRATED METALS AND INSULATORS (HYBRID, 2022)
Lecture 06-Jack Simons Electronic Structure Theory- Møller-Plesset perturbation theory
Determining the CI amplitudes using Moller-Plesset perturbation theory (MPn); Brillouin theorem; strengths and weaknesses of MPn; non-convergence of MPn can give crazy results. (1)Jack Simons Electronic Structure Theory- Session 1- Born-Oppenheimer approximation http://www.youtube.com/
From playlist U of Utah: Jack Simons' Electronic Structure Theory course
Solid state physics and SLT Pt 1 - Singular Learning Theory Seminar 33
This seminar is the first of a two part series exploring the connection between solid state physics and statistical learning theory. It starts with a broad overview of solid state physics, using the examples semiconductors and the magic angle in twisted bilayer graphene to motivate. The wa
From playlist Singular Learning Theory
Fermi's Golden Rule Part 3 - Perturbing Hamiltonian (Light)
https://www.patreon.com/edmundsj If you want to see more of these videos, or would like to say thanks for this one, the best way you can do that is by becoming a patron - see the link above :). And a huge thank you to all my existing patrons - you make these videos possible. In this video
From playlist Optoelectronic and Photonic Devices
Introduction to Solid State Physics, Lecture 11: Band Structure of Electrons in Solids
Upper-level undergraduate course taught at the University of Pittsburgh in the Fall 2015 semester by Sergey Frolov. The course is based on Steven Simon's "Oxford Solid State Basics" textbook. Lectures recorded using Panopto, to see them in Panopto viewer follow this link: https://pitt.host
From playlist Introduction to Solid State Physics