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Magnetic ordering of nuclear spins in an interacting 2D electron gas as a consequence of non-analyticities in the 2D Fermi liquid

Simon, Pascal and Braunecker, Bernd and Loss, Daniel. (2008) Magnetic ordering of nuclear spins in an interacting 2D electron gas as a consequence of non-analyticities in the 2D Fermi liquid. Progress of theoretical physics. Supplement, H. 176. pp. 302-321.

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Official URL: http://edoc.unibas.ch/dok/A5254594

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Abstract

We consider whether nuclear spins embedded in a two-dimensional (2D) interacting electron gas can sustain some ordering at finite temperatures. We start with a Kondo lattice model description and derive art effective magnetic Hamiltonian for the nuclear spins, which is of the RKKY type. The interactions between tire nuclear spins are strongly modified by electron-electron interactions. We show that the nuclear magnetic ordering at finite temperature relies on tire anomalous behavior of the 2D static electron spin susceptibility. This provides a connection between low-dimensional magnetism and non-analyticities in interacting 2D electron systems. Based on various perturbative and non-perturbative approximation schemes in order to establish the general shape of the electron spin susceptibility as function of its wave vector, we show that the nuclear spins locally order ferromagnetically, and that this ordering can become global in certain samples. We also argue that the associated Curie temperature for the nuclear system increases with the electron-electron interactions up to the millikelvin range.
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:Progress of Theoretical Physics
ISSN:0375-9687
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Mar 2012 14:27
Deposited On:22 Mar 2012 13:57

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