On-chain electrodynamics of metallic ( TMTSF ) 2 X salts: Observation of Tomonaga-Luttinger liquid response

摘要: We have measured the electrodynamic response in metallic state of three highly anisotropic conductors, $(\mathrm{TMTSF}{)}_{2}X,$ where $X={\mathrm{PF}}_{6}$, ${\mathrm{AsF}}_{6},$ or ${\mathrm{ClO}}_{4},$ and TMTSF is organic molecule tetramethyltetraselenofulvalene. In all cases we find dramatic deviations from a simple Drude response. The optical conductivity has two features: narrow mode at zero frequency, with small spectral weight, centered around 200 ${\mathrm{}\mathrm{cm}}^{\ensuremath{-}1},$ nearly weight expected for relevant number carriers single particle bandmass. argue that these features are characteristic one-dimensional half- quarter-filled band Coulomb correlations, evaluate finite-energy terms Mott insulator. At high frequencies $(\ensuremath{\Elzxh}\ensuremath{\omega}g{t}_{\ensuremath{\perp}},$ transfer integral perpendicular to chains), frequency dependence ${\ensuremath{\sigma}}_{1}(\ensuremath{\omega})$ agreement calculations based on an interacting Tomonaga-Luttinger liquid, different what uncorrelated semiconductor. zero-frequency shows response, can be adequately described frequency-dependent mass relaxation rate.