Ultrafast melting of a charge-density wave in the Mott insulator 1T-TaS2

Details Ultrafast melting of a charge-density wave in the Mott insulator 1T-TaS2 Ultrafast melting of a charge-density wave in the Mott insulator 1T-TaS2

2010-04-27

arxiv.org/abs/1004.4790v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

Femtosecond time-resolved core-level photoemission spectroscopy with a free-electron laser is used to measure the atomic-site specific charge-order dynamics in the charge-density-wave/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 quasi-equilibrium state with domain-like 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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