Current driven quantum criticality in itinerant electron ferromagnets

Details Current driven quantum criticality in itinerant electron ferromagnets Current driven quantum criticality in itinerant electron ferromagnets

2008-04-24

arxiv.org/abs/0804.3980v2

Phys. Rev. B (Rapid) 77, 220404 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, published version

Scientific paper

10.1103/PhysRevB.77.220404

We determine the effect of an in-plane current flow on the critical properties of a 2d itinerant electron system near a ferromagnetic-paramagnetic quantum critical point. We study a model in which a nonequilibrium steady state is established as a result of exchange of particles and energy with an underlying substrate. the current $\vec{j}$ gives rise not only to an effective temperature equal to the voltage drop over a distance of order the mean free path, but also to symmetry breaking terms of the form $\vec{j}\cdot \vec{nabla}$ in the effective action. The effect of the symmetry breaking on the fluctuational and critical properties is found to be small although (in agreement with previous results) if rotational degrees of freedom are important, the current can make the classically ordered state dynamically unstable.

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