Magnetic ordering of nuclear spins in an interacting two-dimensional electron gas

Pascal Simon*, Bernd Braunecker, Daniel Loss

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

We investigate the magnetic behavior of nuclear spins embedded in a two-dimensional (2D) interacting electron gas using a Kondo lattice model description. We derive an effective magnetic Hamiltonian for the nuclear spins, which is of the Rudermann-Kittel-Kasuya-Yosida type and where the interactions between the nuclear spins are strongly modified by the electron-electron interactions. We show that the nuclear magnetic ordering at finite temperature relies on the (anomalous) behavior of the 2D static electron spin susceptibility and thus provides a connection between low-dimensional magnetism and nonanalyticities in interacting 2D electron systems. Using various perturbative and nonperturbative approximation schemes in order to establish the general shape of the electron spin susceptibility as a function of its wave vector, we show that the nuclear spins locally order ferromagnetically and that this ordering can become global in certain regimes of interest. We demonstrate that the associated Curie temperature for the nuclear system increases with the electron-electron interactions up to the millikelvin range.

Original languageEnglish
Article number045108
Number of pages16
JournalPhysical Review. B, Condensed matter and materials physics
Volume77
Issue number4
DOIs
Publication statusPublished - Jan 2008

Keywords

  • SEMICONDUCTOR QUANTUM DOTS
  • FERMI-LIQUID
  • KONDO LATTICES
  • SYSTEMS
  • FERROMAGNETISM
  • SUSCEPTIBILITY
  • TRANSITION

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