Influence of LongRange Coulomb Interactions on the MetalInsulator Transition in OneDimen.pdf

Applied Physics Report 94-35 Influence of Long-Range Coulomb Interactions on the Metal-Insulator Transition in One-Dimensional Strongly Correlated Electron Systems 4 9 I. V. Krive(1,2) , A. A. Nersesyan(1,3) , M. Jonson(1), and R. I. Shekhter(1) 9 1 (1)Department of Applied Physics, Chalmers University of Technology and G¨oteborg University, l u J S-412 96 G¨oteborg, Sweden 4 (2)B. I. Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Avenue, 310164 1 v Kharkov, Ukraine 5 1 (3)Institute of Physics, Georgian Academy of Sciences, Tamarashvili 6, 380077, Tbilisi, Georgia 0 7 0 4 9 / t Abstract a m - d The influence of long-range Coulomb interactions on the properties of one- n o dimensional (1D) strongly correlated electron systems in vicinity of the metal- c : v insulator phase transition is considered. It is shown that unscreened repulsive i X r Coulomb forces lead to the formation of a 1D Wigner crystal in the metallic a phase and to the transformation of the square-root singularity of the compress- ibility (characterizing the commensurate-incommensurate transition) to a log- arithmic singularity. The properties of the insulating (Mott) phase depend on the character of the short-wavelength screening of the Coulomb forces. For a sufficiently short screening length the characteristics of the charge excitations in the insulating phase are totally determined by the