Velocity renormalization near the Mott transition in a perfectly ordered lattice

L. Burlachkov, M. Weger

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Abstract

In the Lindhard theory for an unscreened electron gas the velocity is renormalized by the electron-electron interactions and actually diverges logarithmically at the Fermi surface. Normally, in 3D systems screening reduces this renormalization to about 5%. We suggest that in quasi-2D systems near the Mott transitions, screening is less effective and consequently the velocity at the FS is increased significantly by the nenormalization. This increase is associated with a decrease in the single-particle density of states, which reduces the screening further, enhancing this effect. This model applies to a highly ordered layered crystal, where k (in the plane) is a good quantum number.

Original languageEnglish
Pages (from-to)283-292
Number of pages10
JournalPhysica B: Condensed Matter
Volume183
Issue number3
DOIs
StatePublished - Mar 1993

Bibliographical note

Funding Information:
It is a pleasure to acknowledgeh elpful and stimulating discussionsw ith M. Kaveh and A. Finkelstein. One of the authors( L.B.) acknowledges support from the Raschi Foundation and the Israel Academy of Sciences.

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