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In narrow-band conductors a weakly screened Coulomb interelectron repulsioncan supress narrow-band electrons' hopping, resulting in formation of a``frozen'' electron phase which differs principally from any known macroscopicself-localized electron state including the Wigner crystal. In a zero-bandwidthlimit the ``frozen'' electron phase is a classical lattice system with along-range interparticle repulsion. The ground state of such systems has beenconsidered in the case of two dimensions for an isotropic pair potential of themutual particle repulsion. It has been shown that particle ordering intostripes and effective lowering of dimension universally resides in the groundstate for any physically reasonable pair potential and for any geometry of theconductor lattice. On the basis of this fact a rigorous general procedure tofully describe the ground state has been formulated. Arguments have beenadduced that charge ordering in High-T_c superconductors testifies to presenceof a ``frozen'' electron phase in these systems.Comment: 5 pages, LaTeX 2.09, 1 figure in external PostScript files. To appear  in Phys.Rev B Rapid Communication

low temperature physics

The ground state of the “frozen” electron phase in two-dimensional narrow-band conductors with a long-range interelectron repulsion. Stripe formation and effective lowering of dimension