Semester | Mand. | Option | Filières |
x |
Lecture | 28 |
Study plan | Semester | Mand. | Option | Filières |
EDPY - Physics 2021-22 | x |
Cursus | Sem. | Type |
---|---|---|
Physics | Opt. |
The core notion is the electronic band dispersion: how it is formed, how it defines the charge dynamics, how it is modified upon perturbing the Hamiltonian and accounting for additional electronic interactions.
Formation of the electronic band structure, single particle in the periodic potential
Tracking the formation of the electronic band structure with different models
Singling out common aspects of the electronic states in the periodic potential
Similarity of the electronic states in the periodic crystal to the free electronic states in vacuum Packets of plane waves and Bloch waves
- the form of the wave function and band dispersion in the crossover to the classical picture
Band structure as a basis for understanding electronic properties of materials
Multiple electrons inside a crystal
Band filling, Fermi surface, electron count Mean-field approximation
Photoemission
- essence of electron spectroscopy
- spectrum of a matrix in mathematics
- photoemission process, conservation of energy and momentum; photoemission as a projection of the initial state to the (single-particle) plane waves
Examples of the electronic structure for real materials from angle-resolved photoemission spectroscopy (ARPES)
Response of the particle in the periodic potential to the external perturbation
Electron distribution at finite temperatures, Fermi function Heat capacity and plasma frequency
Electrical transport, response to external electrical and magnetic field
- Bloch wave packet in the applied field
- electron scattering, mean free path, lifetime
- derivation of the expressions for the electrical conductivity, Hall coefficient and magnetoresistance based on the electronic band dispersion
Measured and calculated Hall coefficient
- band structure obtained in the theoretical calculation
- band structure from experimental ARPES measurements
- magnetoresistance, Seebeck coefficient, other transport coefficients
Symmetry breaking
Impurity states Surface states
Additional static periodic potential, charge-density-wave
- electron susceptibility, Fermi surface nesting, examples from ARPES
Band hybridization
Chain of atoms with two energy levels Two adjacent chains of atoms
Introducing off-diagonal elements to the Hamiltonian
Interacting electronic systems
Electron-phonon interactions Superconductivity
- Bose-Einstein condensation
- basic understanding of electron pairing
- BCS theory
- materials with record critical temperatures
Electron-electron interactions
- many-body problem in classical physics
- success and breakdown of the mean field theory
- Wigner crystal, Mott insulator, localization of electrons in solids
- electron-electron scattering, electronic self energy
Fermi liquid theory Spectral function
ARPES studies of the interacting electronic systems
electronic structure, band structure, electronic spectrum, spectral function, electronic interactions, angle-resolved photoemission spectroscopy (ARPES)
general course of quantum mechanics solid state physics
understand the electronic states inside the periodic crystal and their response to the external perturbations
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