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.
Talks
| Date | Title | Tutor | Speaker | |
|---|---|---|---|---|
| 7.5. | Theoretical background | D. Khomskii | ||
| 14.5. | Angular-resolved photoemission | T. Koethe | A. Kolmer | |
| 21.5. | Transport & thermodynamic properties | T. Willers | J. Powers | |
| 4.6. | Drude peak in low-frequency spectroscopy | J. Hemberger | W. Jolie | |
| 11.6. | Optical spectroscopy | M. Grüninger | ||
| 18.6. | XAS & RIXS with hard X-rays | A. Severing | M. Sundermann | |
| 25.6. | Luttinger liquids: 1D metals and 1D magnets | T. Lorenz | S. Harms | |
| 2.7. | STM: Quasi-particle scattering | C. Busse | ||
| 9.7. | Neutron scattering | M. Braden | F. Waßer |