Umklapp processes for electrons and their renormalization-group flow

Deepak Kumar, ; Rajaraman, R. (1996) Umklapp processes for electrons and their renormalization-group flow Physical Review B, 54 (7). pp. 4379-4382. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v54/i7/p4379_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.54.4379

Abstract

We study umklapp couplings and their renormalization-group flow for electrons in a two-dimensional lattice. It is shown that the effective low-energy Hamiltonian involves not only forward scattering, but also considerable nonforward umklapp scattering, when the electrons fill a substantial fraction of the valence band. The behavior of these couplings under the renormalization group is studied in the loop expansion. It is shown that they remain marginal. We conclude with the possible consequences of this on properties of such electronic systems and their Fermi-liquid theory.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:9880
Deposited On:02 Nov 2010 10:33
Last Modified:16 May 2016 19:37

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