dc.contributor
Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.contributor
Universitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity
dc.contributor.author
Arias de Saavedra, F.
dc.contributor.author
Mazzanti Castrillejo, Fernando Pablo
dc.contributor.author
Boronat Medico, Jordi
dc.contributor.author
Polls, A.
dc.date.issued
2012-03-12
dc.identifier
Arias , F. [et al.]. Ferromagnetic transition of a two-component Fermi gas of hard spheres. "Physical review A", 12 Març 2012, vol. 85, núm. 3, p. 1-6.
dc.identifier
https://hdl.handle.net/2117/16422
dc.identifier
10.1103/PhysRevA.85.033615
dc.description.abstract
We use microscopic many-body theory to analyze the problem of itinerant ferromagnetism in a repulsive atomic Fermi gas of hard spheres. Using simple arguments we show that the available theoretical predictions for the onset of the ferromagnetic transition predict a transition point at a density (kF a ∼ 1) that is too large to be compatible with the universal low-density expansion of the energy. We present variational calculations for the hard-sphere Fermi gas, in the framework of Fermi hypernetted chain theory, that shift the transition to higher densities (kF a ∼ 1.8). Backflow correlations, which are mainly active in the unpolarized system, are essential for this shift.
dc.description.abstract
Postprint (published version)
dc.format
application/pdf
dc.relation
http://pra.aps.org/abstract/PRA/v85/i3/e033615
dc.rights
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.subject
Àrees temàtiques de la UPC::Física
dc.subject
Ferromagnetism
dc.subject
Ferromagnetisme
dc.subject
Electrons--Distribució
dc.title
Ferromagnetic transition of a two-component Fermi gas of hard spheres
