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Ultrafast Melting of a Charge-Density Wave in the Mott Insulator 1T-TaS2

  • S. Hellmann
  • M. Beye
  • C. Sohrt
  • T. Rohwer
  • F. Sorgenfrei
  • H. Redlin
  • M. Kallaene
  • M. Marczynski-Buehlow
  • Franz Hennies
  • M. Bauer
  • A. Foehlisch
  • L. Kipp
  • W. Wurth
  • K. Rossnagel
Publiceringsår: 2010
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review Letters
Volym: 105
Nummer: 18
Dokumenttyp: Artikel i tidskrift
Förlag: American Physical Society


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.


  • Physical Sciences
  • Natural Sciences


  • ISSN: 1079-7114

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