PACS. 78.20.-e Optical properties of bulk materials and thin films[:AND:]71.10.Pm Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.)
Springer Online Journal Archives 1860-2000
Abstract: Optical experiments are reported for the metallic state of the linear chain compound (TMTSF)2ClO4. For the electric field polarized both along the highly (a) and intermediately (b ) conducting directions, a zero energy (ZE) mode and a finite energy mode (FE) are observed. The large anisotropy in the spectral weight of the FE mode is consistent with the band structure, however the spectral weight of the ZE mode is surprisingly isotropic. In the least conducting (c *) direction, the low frequency optical conductivity along with the dc conductivity indicate the presence of a (small) Drude component only at temperatures below 10 K. These observations provide evidence for a correlation induced semimetallic state, with a 3D to 2D crossover with increasing temperature.
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