2008/04/30 by Aditi Mitra, Andrew J. Millis · 4 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Criticality #Current (fluid) #Electron #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Nuclear physics #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum mechanics #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.77.220404
published as Phys. Rev. B (Rapid) 77, 220404 (2008) · 4 pages, published version
openalex publication_date 2008/06/13 · arxiv created 2008/06/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We determine the effect of an in-plane current flow on the critical properties of a two-dimensional 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 \stackrelPj 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 \stackrelPj\ensuremath⋅\stackrelP\ensuremath∇ 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.