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Volume 171, 2014
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How fast can a Peierls–Mott insulator be melted?

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Abstract

Time- and angle-resolved extreme ultraviolet photoemission spectroscopy is used to directly determine the momentum-dependent electronic structure dynamics in the layered Peierls–Mott insulators 1T-TaS2 and 1T-TaSe2 on the sub-300 fs time scale. Extracted spectroscopic order parameters display a global two-time-scale dynamics indicating a quasi-instantaneous loss of the electronic orders and a subsequent coherent suppression of the lattice distortion on a time scale related to the frequency of the charge-density–wave amplitude mode. After one half-cycle of coherent amplitude-mode vibration, a crossover state between insulator and metal with partially filled-in and partially closed Mott and Peierls gaps is reached. The results are discussed within the wider context of electronic order quenching in complex materials.

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Publication details

The article was received on 17 Mar 2014, accepted on 06 May 2014 and first published on 07 May 2014


Article type: Paper
DOI: 10.1039/C4FD00042K
Citation: Faraday Discuss., 2014,171, 243-257
  • Open access: Creative Commons BY license
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    How fast can a Peierls–Mott insulator be melted?

    C. Sohrt, A. Stange, M. Bauer and K. Rossnagel, Faraday Discuss., 2014, 171, 243
    DOI: 10.1039/C4FD00042K

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