zum Inhalt springen

Oberseminar SS 2012


"Fermi-liquid vs. non-Fermi-liquid behavior"

Mo. 14:00-15:00 h at the Seminar Room 201 of the II. Physikalisches Institut, University of Cologne.

One of the most challenging issues in describing the metallic state is the treatment of the electron-electron interaction. Because the Coulomb interaction is strong and long-ranged a low-order perturbation theoretical treatment is not sufficient to obtain a quantitatively correct description of even simple metals. Instead one has to use the complex machinery of many-body physics. Nevertheless, experiments show that the physical properties of many metals behave as expected for a non-interacting, i.e. chargeless, gas of fermions. This surprising simplification can be understood within the so-called Fermi-liquid theory, which has originally been proposed by L.D. Landau in 1956. In this seminar the basic features of Fermi-liquid behavior will be discussed. The aim of the talks of this seminar is to work out the characteristic fingerprints of Fermi-liquid behavior with respect to certain experimental techniques and also to show where Fermi-liquid theory breaks down.




7.5. Theoretical background D. Khomskii
14.5. Angular-resolved photoemission T. Koethe A. Kolmer pdf
21.5. Transport & thermodynamic properties T. Willers J. Powers pdf
4.6. Drude peak in low-frequency spectroscopy J. Hemberger W. Jolie pdf
11.6. Optical spectroscopy M. Grüninger
18.6. XAS & RIXS with hard X-rays A. Severing M. Sundermann pdf
25.6. Luttinger liquids: 1D metals and 1D magnets T. Lorenz S. Harms pdf

STM: Quasi-particle scattering

C. Busse
9.7. Neutron scattering M. Braden F. Waßer pdf