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Träfflista för sökning "WFRF:(Rossnagel S.) srt2:(2010-2014)"

Sökning: WFRF:(Rossnagel S.) > (2010-2014)

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  • Hellmann, S., et al. (författare)
  • Time-resolved x-ray photoelectron spectroscopy at FLASH
  • 2012
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 14
  • Tidskriftsartikel (refereegranskat)abstract
    • The technique of time-resolved pump-probe x-ray photoelectron spectroscopy using the free-electron laser in Hamburg (FLASH) is described in detail. Particular foci lie on the macrobunch resolving detection scheme, the role of vacuum space-charge effects and the synchronization of pump and probe lasers. In an exemplary case study, the complete Ta 4f core-level dynamics in the layered charge-density-wave (CDW) compound 1T-TaS2 in response to impulsive optical excitation is measured on the sub-picosecond to nanosecond timescale. The observed multi-component dynamics is related to the intrinsic melting and reformation of the CDW as well as to extrinsic pump-laser-induced vacuum space-charge effects.
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  • Hellmann, S., et al. (författare)
  • Ultrafast Melting of a Charge-Density Wave in the Mott Insulator 1T-TaS2
  • 2010
  • Ingår i: Physical Review Letters. - 1079-7114. ; 105:18
  • Tidskriftsartikel (refereegranskat)abstract
    • Femtosecond time-resolved core-level photoemission spectroscopy with a free-electron laser is used to measure the atomic-site specific charge-order dynamics of the charge-density wave in the Mott insulator 1T-TaS2. After strong photoexcitation, a prompt loss of charge order and subsequent fast equilibration dynamics of the electron-lattice system are observed. On the time scale of electron-phonon thermalization, about 1 ps, the system is driven across a phase transition from a long-range charge ordered state to a quasiequilibrium state with domainlike short-range charge and lattice order. The experiment opens the way to study the nonequilibrium dynamics of condensed matter systems with full elemental, chemical, and atomic-site selectivity.
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