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<p>Charge-density-wave (CDW) materials having a strong electron-phonon coupling provide a powerful platform for investigating the intricate interplay between lattice fluctuations and a macroscopic quantum order. Here, using time- and angle-resolved photoemission spectroscopy (TR-ARPES), we reveal that the CDW gap closure in VTe<sub>2</sub> is dominated by an incoherent process evolving on a sub-picosecond timescale, challenging the conventional view that the gap dynamics is primarily governed by the excitation of the CDW amplitude modes. Our findings, supported by a three-temperature model, show that the CDW gap evolution can be described by considering the population of a subset of strongly-coupled optical phonon modes, which leads to an increase in the lattice fluctuations. This microscopic framework extends beyond VTe<sub>2</sub>, offering a universal perspective for understanding the light-induced phase transition in strongly-coupled CDW systems.</p>

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Quenching the electronic order in a strongly-coupled charge-density-wave system by enhanced lattice fluctuations

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月10日

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  • Manuel Tuniz,
  • Denny Puntel,
  • Wibke Bronsch,
  • Francesco Sammartino,
  • Gian Marco Pierantozzi,
  • Riccardo Cucini,
  • Fulvio Parmigiani,
  • Federico Cilento

摘要

Charge-density-wave (CDW) materials having a strong electron-phonon coupling provide a powerful platform for investigating the intricate interplay between lattice fluctuations and a macroscopic quantum order. Here, using time- and angle-resolved photoemission spectroscopy (TR-ARPES), we reveal that the CDW gap closure in VTe2 is dominated by an incoherent process evolving on a sub-picosecond timescale, challenging the conventional view that the gap dynamics is primarily governed by the excitation of the CDW amplitude modes. Our findings, supported by a three-temperature model, show that the CDW gap evolution can be described by considering the population of a subset of strongly-coupled optical phonon modes, which leads to an increase in the lattice fluctuations. This microscopic framework extends beyond VTe2, offering a universal perspective for understanding the light-induced phase transition in strongly-coupled CDW systems.