Intrinsic exchange-correlation magnetic fields in exact current density functional theory for degenerate systems

J. D. Ramsden and R. W. Godby
Phys. Rev. B 88, 195115 – Published 8 November 2013

Abstract

We calculate the exact Kohn-Sham (KS) scalar and vector potentials that reproduce, within current density functional theory, the steady-state density and current density corresponding to an electron quasiparticle added to the ground state of a model quantum wire. Our results show that, even in the absence of an external magnetic field, a KS description of a steady-state system in general requires a nonzero exchange-correlation magnetic field that is purely mechanical in origin. The KS paramagnetic current density is not, in general, that of the interacting system in any gauge.

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  • Received 9 April 2013

DOI:https://doi.org/10.1103/PhysRevB.88.195115

©2013 American Physical Society

Authors & Affiliations

J. D. Ramsden and R. W. Godby

  • Department of Physics, University of York and European Theoretical Spectroscopy Facility (ETSF), Heslington, York YO10 5DD, United Kingdom

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Issue

Vol. 88, Iss. 19 — 15 November 2013

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