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Time-resolved optical spectroscopy of collective and single-particleexcitations of 1T-TaS2 and 2H-TaSe2 reveals the presence of a large gap in theexcitation spectrum on the femtosecond timescale, associated with the formationof various degrees of CDW order. In common with superconducting cuprates,excitations with energies less than the full gap show much slower relaxation.This separation of timescales cannot be explained in a quasi-2D Fermi-Liquidpicture with an anisotropic gap but rather suggests the formation of afluctuating spatially inhomogeneous state eventually forming a long-rangeordered state at low temperatures.Comment: to appear in Phys. Rev.B Rapid Com

physical review. b, condensed matter

Femtosecond snapshots of gap-forming charge-density-wave correlations in quasi-two-dimensional dichalcogenides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mo>−</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TaS</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:mi>H</…

Femtosecond snapshots of gap-forming charge-density-wave correlations in quasi-two-dimensional dichalcogenides1T−TaS2and2H