Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 32: Surface or interface magnetism
O 32.4: Vortrag
Mittwoch, 25. März 2009, 11:15–11:30, SCH A315
Non-collinear magnetic phases in the electron gas: Results from Hartree-Fock and RDMFT — •Florian Eich1,2, Stefan Kurth2,3, César R. Proetto2,4, Sangeeta Sharma1,2, and E. K. U. Gross2 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin — 2Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin — 3Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (ETSF), Dpto. de Física de Materiales, Universidad del País Vasco UPV/EHU, Centro Mixto CSIC-UPV/EHU, Av. Tolosa 72, E-20018 San Sebastián, Spain — 4Centro Atómico Bariloche and Instituto Balseiro, 8400 S. C. de Bariloche, Río Negro, Argentina
In 1962 Overhauser [1] demonstrated that the Homogeneous Electron Gas exhibits an instability w.r.t. a Spin Density Wave (SDW) within the Hartree-Fock approximation. Overhauser showed that it is possible to construct a spin-spiral state that is lower in energy than the collinear paramagnetic state at any density. We investigated the properties of this broken symmetry groundstate using the framework of Reduced Density Matrix Functional Theory (RDMFT). Specifically we determined the dependence of the spin-spiral wavelength on the density. Furthermore it was possible to determine a critical density for which a transition to the ferromagnetic configuration takes place.
[1] A.W. Overhauser, Phys. Rev. 128, 1437 (1962)