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29 March 2024
 
  » arxiv » cond-mat/9801198

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On-chain electrodynamics of metallic (TMTSF)_2 X salts: Observation of Tomonaga-Luttinger liquid response
A. Schwartz ; M. Dressel ; G. Gruner ; V. Vescoli ; L. Degiorgi ; T. Giamarchi ;
Date 20 Dec 1997
Journal Phys. Rev. B 58, 1261 (1998).
Subject Strongly Correlated Electrons | cond-mat.str-el
Affiliation UCLA, ETH-Zurich, UPS-Orsay
AbstractWe have measured the electrodynamic response in the metallic state of three highly anisotropic conductors, (TMTSF)_2 X, where X=PF_6, AsF_6, or ClO_4, and TMTSF is the organic molecule tetramethyltetraselenofulvalene. In all three cases we find dramatic deviations from a simple Drude response. The optical conductivity has two features: a narrow mode at zero frequency, with a small spectral weight, and a mode centered around 200 cm^{-1}, with nearly all of the spectral weight expected for the relevant number of carriers and single particle bandmass. We argue that these features are characteristic of a nearly one-dimensional half- or quarter-filled band with Coulomb correlations, and evaluate the finite energy mode in terms of a one-dimensional Mott insulator. At high frequencies (hbaromega > t_perp, the transfer integral perpendicular to the chains), the frequency dependence of the optical conductivity sigma_1(omega) is in agreement with calculations based on an interacting Tomonaga-Luttinger liquid, and is different from what is expected for an uncorrelated one-dimensional semiconductor. The zero frequency mode shows deviations from a simple Drude response, and can be adequately described with a frequency dependent mass and relaxation rate.
Source arXiv, cond-mat/9801198
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