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

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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.
Original languageEnglish
Article number95115
JournalPhysical Review B: Condensed Matter and Materials Physics
Issue number19
Publication statusPublished - 8 Nov 2013

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