Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-03-28
Physics
Condensed Matter
Strongly Correlated Electrons
to appear in Phys. Rev.B Rapid Comm
Scientific paper
10.1103/PhysRevB.66.041101
Time-resolved optical spectroscopy of collective and single-particle excitations of 1T-TaS2 and 2H-TaSe2 reveals the presence of a large gap in the excitation spectrum on the femtosecond timescale, associated with the formation of 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-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.
Berger Heinz
Demsar Jure
Forró László
Mihailovic Dragan
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