Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Competition for Gerhard Ertl Young Investigator Award

O 69.4: Vortrag

Donnerstag, 29. März 2012, 12:00–12:30, A 060

Disentangling the Degrees of Freedom of a Charge Density Wave in Momentum, Temperature and Time — •Robert Moore — Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park CA, USA

Understanding the emergence of collective behavior in correlated electron systems remains at the forefront of modern condensed matter physics. The key to such an understanding is disentangling the contributions from the coupling of degrees of freedom in exotic many body states. Density waves, both of charge and spin, have been studied for decades, however, there are still open questions that need to be resolved for a complete description of the phenomena. As an example, the family of the rare earth tri-tellurides (RTe3) exhibits prototypical charge density wave behavior while dramatically violating traditional theory. Its simplicity in atomic and electronic structure provides unique opportunities to gain further insight in such discrepancies between theoretical descriptions and experimental realizations of electron-phonon coupling. Our recent results will be reviewed from angle resolved photoemission spectroscopy (ARPES), time-resolved ARPES and time-resolved resonant soft x-ray diffraction techniques focusing on both electronic and lattice response to the density wave instability in momentum, temperature and time. New insights into electron-phonon coupling and the density wave phenomena are revealed and will be discussed.