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Momentum dependence of the spin susceptibility in two dimensions : nonanalytic corrections in the Cooper channel

Chesi, Stefano and Zak, Robert Andrzej and Simon, Pascal and Loss, Daniel. (2009) Momentum dependence of the spin susceptibility in two dimensions : nonanalytic corrections in the Cooper channel. Physical Review B, Vol. 79, H. 11 , 115445, 10 S..

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Official URL: http://edoc.unibas.ch/dok/A5254590

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Abstract

We consider the effect of rescattering of pairs of quasiparticles in the Cooper channel resulting in the strong renormalization of second-order corrections to the spin susceptibility in a two-dimensional electron system. We use the Fourier expansion of the scattering potential in the vicinity of the Fermi surface to find that each harmonic becomes renormalized independently. Since some of those harmonics are negative, the first derivative of the spin susceptibility is bound to be negative at small momenta, in contrast to the lowest order perturbation theory result, which predicts a positive slope. We present in detail an effective method to calculate diagrammatically corrections to the spin susceptibility to infinite order.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Institute of Physics
ISSN:0163-1829
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:49

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