Computational Materials Physics

quick start
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practical info
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setting the stage
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the creation of materials from thought
the ab initio way  
solids as quantum systems
so what’s the problem?
advantages
theory versus computation
hardware
software
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density functional theory 
24 Topics
a DFT teaser
functions and functionals
the Schrödinger equation
the Born-Oppenheimer approximation
(post-)Hartree-Fock method(s)
the external potential
the electron density
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for project only (w2)
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first Hohenberg-Kohn theorem
second Hohenberg-Kohn theorem
Kohn-Sham equations
XC-functional
correlation
Hartree-Fock versus DFT
numerical solution methods
for later use
(optional) basis sets in more depth
(optional) back to the teaser
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crystallography
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CIF files and how to find them
what’s in a cif ?
more useful tools
(optional) more on crystallography
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geometry optimization
18 Topics
hands-on task
step 1: volume optimization
bulk modulus and pressure
step 2: cell shape
upload your answer (geom 1)
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introduction to forces
classical forces
quantum forces
symmetry and forces
step 3: position optimization
full optimization
phase diagrams
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electronic structure
9 Topics
reciprocal space
plane waves and the reciprocal lattice
quantum numbers
plotting wave functions and densities
quantum numbers for a crystal
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chemical bonding
7 Topics
chemical bonding in textbooks
cohesive energy problem
chemical bonding from DFT
an old puzzle
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elasticity
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elastic constants: definition
computing elastic constants
applications of elastic constants
a hard example ;-)
a database of elastic constants
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supercells and surfaces
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concept and uses
surface properties
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precision and accuracy
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P&A lecture
P&A tasks
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magnetism
4 Topics
spin magnetism
orbital magnetism
long-range magnetic order
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phonons and temperature
4 Topics
the basics of phonons
the Phonopy code : a guided example
phonons by QE + visualizer
soft modes and phase transitions
band gaps
2 Topics
which gap?
gap predictions
let’s play!
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setting the stage – prepare your environment
setting the stage – HPC info (Flanders only)
setting the stage – help section
density functional theory 1 – a basic calculation
density functional theory 2 – basis set size and k-mesh
density functional theory 2 – convergence testing
crystallography – crystal viewers
crystallography – from cif to DFT input
geometry optimization – geometry: towards the ground state
geometry optimization – geometry: E(V) and EOS
electronic structure – band structure and DOS
chemical bonding – charge density difference plots
elasticity – elasticity
supercells and surfaces – creating supercells
supercells and surfaces – work function
magnetism
a frozen phonon calculation
project
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w2 – project 2026-2027
w2 – assessment choice / sign up for project
w4 – project milestone 1
w8 – project milestone 2
w9 – online writing in latex
w12 – submit your project
w12 – gallery of project results (2026)
w12 – self-assessment and team introspection
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second Hohenberg-Kohn theorem

Computational Materials Physics density functional theory  second Hohenberg-Kohn theorem

Not surprisingly, after the first follows the second Hohenberg-Kohn theorem:

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Someone tells you: “To me it looks like the 2nd theorem is a natural consequence of the 1st one, and not a separate independent theorem.” Do you agree? Explain the arguments you have to support your opinion in this forum:

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If you want to dig deeper (now or later), you may study this pedagogical lecture by Mel Levy on (mainly) the Hohenberg-Kohn theorems (part of the CECAM school on Teaching the Theory in DFT):

expected time: 20m
report time spent (page code AW03B)

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