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Lecture: Symmetry concepts and their applications in solid state physics and materials science - Details
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Lehrveranstaltung wird online/digital abgehalten.

General information

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Course number PHM-0228
Semester SS 2020
Current number of participants 3
Home institute Lehrstuhl für Experimentalphysik V
Courses type Lecture in category Teaching
First date Tue , 21.04.2020 09:00 - 12:00
Learning organization The course aims at providing insights into the simple use of symmetry concepts to understand phenomena and material properties without performing detailed calculations. On the same basis, it gives some guides how to make minimal plans for experiments using the symmetry of the studied materials or vice versa how to determine the symmetry of materials from the output of experiments.
Performance record oral exam
Online/Digitale Veranstaltung Veranstaltung wird online/digital abgehalten.
Hauptunterrichtssprache englisch
Miscellanea I will upload my lecture notes in advance and the course will be held via skype conferencing.
ECTS points 6

Course location / Course dates

n.a Tuesday: 09:00 - 12:00, weekly

Module assignments

Comment/Description

Contents: The topical outline of the course is as follows:
• Introduction and common examples
o Motivating examples
o Polar and axial vectors and tensors
o Spatial and temporal symmetries and charge conjugation
o Symmetries of measurable quantities and fields
o Symmetries of physical laws (classical and quantum)
o Conservation laws (linear and angular momentum, energy, etc.)
o Symmetry of measurement configurations (reciprocity, etc.)
• Neumann principle
o Linear response theory and Onsager relations
o Applications to vector and tensor quantities: electric and magnetic dipole moment of molecules; ferroelectricity, ferromagnetism, piezoelectricity and magnetoelectricity in crystals; wave propagation in anisotropic media (sound and light)
• Symmetry allowed energy terms
o On the level of classical free energy: Polar, nematic and magnetic order parameters (Landau expansion)
o On the level of Hamiltonians: Molecular vibrations, crystal field potential, magnetic interactions
• Symmetry of physical states
o Spatial inversion and parity eigenstates
o Discrete translations and the Bloch states
• Spontaneous symmetry breaking upon phase transitions (Landau theory)
• Outlook: Symmetry guides for skyrmion-host materials, multiferroic compounds and axion insulators

Admission settings

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