Workshop on Ultrafast Dynamics in Strongly Correlated Systems

Session

Charge density waves I

T5

5 Apr 2011, 08:30

ETH Zurich, Campus Science City, HIT Building

Description

Chair: J. Petersen

51. Transient electronic structure and coherent phonon dynamics during photoinduced insulator to metal transitions

Martin Wolf (Fritz-Haber-Institute, Dept. of Physical Chemistry, 14195 Berlin, Germany)

05/04/2011, 08:30

Invited talk

The electronic properties of complex materials are often governed by strong electron-phonon coupling and many-body correlation effects leading to phenomena like metal insulator transitions or superconductivity and the formation of broken symmetry ground states. This interplay between electronic and phonon degrees of freedom is of particular importance in thermally or optically driven...

24. Femtosecond time-resolved photoemission of layered charge-density-wave compounds

Kai Rossnagel (University of Kiel)

05/04/2011, 09:10

Talk

Charge-density waves (CDWs) are broken-symmetry states of low-dimensional materials that are brought about by strong electron-phonon interaction. Yet, surprisingly, a clear microscopic understanding beyond this statement has not really evolved for this classical paradigm of condensed matter physics. In quasi-two-dimensional systems, for example, the common approaches based on ARPES band...

3. Phase rigidity and power law decay for large-amplitude coherent phonons in bismuth

Mikhail Lebedev (ISSP RAS)

05/04/2011, 09:30

Talk

Fully symmetric A1g coherent phonons of bismuth have been investigated in a wide range of pump pulse intensities by the ultrafast pump-probe technique. It has been shown that in the linear regime, implemented only for low pump intensities, the coherent amplitude is proportional to the pump intensity, whereas the relaxation rate of the coherent state and its frequency remain unchanged. In the...