Condensed Matter Physics Seminar
Nature of Charge Carriers in Bad Metals
Department of Physics
University of Connecticut
High temperature superconductivity, colossal magneto-resistance, metal-insulator transitions are among the properties of transition metal oxides that have been the prominent in condensed matter physics over the past decade. A unifying theme of research into these materials is that they are in, or at least close to, a regime where the electronic properties are no longer determined by the traditional model of nearly free electrons, or quasi-particles. Some new type of many-electron physics is needed. However, actually measuring whether quasi-particles dominate the electron dynamics is difficult. A leading experiment that purports to do so is photoemission spectroscopy, particularly in the angular-resolved mode (ARPES). Unfortunately, there has been very little systematic study of what is a true signature of a quasi-particle in ARPES. This talk will review data on both simple metals and complex oxides to examine what is reliably known about measuring electron dynamics using this spectroscopy.
Note: This talk is meant to be both a condensed matter seminar as well as a lecture for the class on Special Topics in Condensed Matter Physics.
Thursday, March 4, 2004
Gant Science Complex
(The seminar is followed by coffee/tea, cookies, and an informal discussions.)