Quasiteilchen und Wärmetransport - Einzelansicht

Format

2V+1Ü (4.5 LP) oder 2V+2Ü (6 LP), für den Modulbaukasten von BSc-Studierenden und MSc-Studierenden.

Inhalt

You are probably used to electrons or photons as ”elementary particles”. But in a solid-state material, electrons acquire a different effective mass, and a missing electron behaves likes a positive charge -- one then talks about quasiparticles. The spin degree of freedom with its magnetic moment can become a magnetisation (or spin) wave, also known as magnon. Light in a solid polarises the material, giving rise to a refractive index or a mixed matter-light excitation, also know as plasmon or polariton. Finally, mechanical vibrations of a solid can be quantised into phonons.

The lecture reviews the physical basis for these quasi-particles, their dispersion relations (characteristic velocities) and their contribution to the specific heat and heat transport (conductivity). Theoretical tools from Bose and Fermi gases (and the Boltzmann equation) will be used for modelling. We also discuss experimental techniques, in particular in relation to nano-structures (thin films or small particles). Mechanistic chain models will be analysed in the final part from a quantum thermodynamics perspective. 

Moodle

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