2002/03/28 by J. Demšar, J. Demsar, Lászlø Forró +4
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Organic and Molecular Conductors Research #Perovskite Materials and Applications #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.66.041101
to appear in Phys. Rev.B Rapid Comm
arxiv created 2002/03/28 · openalex publication_date 2002/06/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Time-resolved optical spectroscopy of collective and single-particle excitations of 1T\ensuremath-TaS2 and 2H\ensuremath-TaSe2 reveals the presence of a large gap in the excitation spectrum on the femtosecond time scale, associated with the formation of various degrees of charge-density-wave order. In common with superconducting cuprates, excitations with energies less than the full gap show much slower relaxation. This separation of time scales cannot be explained in a quasi-two-dimensional Fermi-liquid picture with an anisotropic gap but rather suggests the formation of a fluctuating spatially inhomogeneous state eventually forming a long-range ordered state at low temperatures.