Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.18: Poster

Mittwoch, 16. März 2011, 14:00–18:00, P3

Effects of finite range exchange interactions in the RKKY spin density oscillations — •Sergey Smirnov — Institut für Theoretische Physik, Universität Regensburg

We study the impact of a finite spin distribution of a localized spin, embedded in a Fermi sea of noninteracting conduction electrons, on the induced spin density oscillations underlying the RKKY indirect exchange effect. Specifically, a one-dimensional (1D) ring at finite temperatures is considered. We show that any small but finite interaction radius always produces an essential change in the spin density oscillations if the number of electrons is large enough [1]. To understand the physical role, played by the impurity spin localization radius in the RKKY spin-density oscillations, we consider a system where those oscillations exist only if this radius is finite. The system represents a half-infinite 1D quantum wire with a magnetic ion placed at its edge. It is analytically demonstrated that the effect of the finite spin localization radius is to reduce the effective mass of the conduction electrons [2].
S. Smirnov, Phys. Rev. B 79, 134403 (2009)
S. Smirnov, Phys. Rev. B 81, 214425 (2010)