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TT: Fachverband Tiefe Temperaturen

TT 31: Correlated Electrons: Low-Dimensional Systems -Materials 1

TT 31.4: Vortrag

Dienstag, 12. März 2013, 10:15–10:30, H41

The Luttinger liquid theory of molybdenum purple bronze Li_0.9Mo₆O₁₉ — •Piotr Chudzinski^1,2, Thomas Jarlborg¹, and Thierry Giamarchi¹ — ¹DPMC-MaNEP, Universite de Geneve — ²University of Regensburg

We study a quasi-1D material, the purple bronze Li_0.9Mo₆O₁₉ which becomes superconductor at 1.9K. Firstly, the band structure is calculated by use of ab-initio DFT-LMTO method. The unusual, very 1-dimensional band dispersion obtained in previous band calculations is confirmed and the overall band structure agrees reasonably with existing photoemission data. Dispersion perpendicular to the main dispersive direction is obtained and investigated in detail. Temperature and disorder effects are evaluated, in particular we check their influence on the band broadening. Based on this, in the second part of our work we derive an effective low energy theory within the Luttinger liquid framework. We estimate the strength of possible instabilities and values of charge modes compressibilities. Our aim is to understand experimental findings, in particular the ones which are certainly lying within 1D regime. We discuss the validity of our approach and further perspectives for the lower energy phases.