Velocity renormalization near the Mott transition in a perfectly ordered lattice (II)

M. Weger*, L. Burlachkov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We consider a medium-density electron gas, near the Wigner-Mott transition, immersed in a medium with a background dielectric constant ε0(q, ω)that is very large at q = 0, ω = 0, but falls sharply with increasing q and/or ω. We consider the dependence of the screening parameter for state k on the energy of this state. We find that the electronic velocity is enhanced considerably at k = kF, somewhat similar to the enhancement found by Lindhard in 1954 for an unscreened electron gas. We use parameters applicable to high-Tc cuprates. We find that the maximum of v(k) around kF is very sharp, the width being a few meV, somewhat smaller than the frequency at which the dielectric constant ε0(q, ω) drops. We relate this velocity peak to the normal-state transport properties of the cuprates and several other systems, and to the superconductivity. We point out specific experiments that suggest a large enhancement ofvF.

Original languageEnglish
Pages (from-to)337-360
Number of pages24
JournalPhysica B: Condensed Matter
Volume198
Issue number4
DOIs
StatePublished - May 1994

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