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

TY - JOUR

T1 - Intrinsic exchange-correlation magnetic fields in exact current density functional theory for degenerate systems

AU - Ramsden, J.D.

AU - Godby, R.W.

PY - 2013/11/8

Y1 - 2013/11/8

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84887536439&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.88.195115

DO - 10.1103/PhysRevB.88.195115

M3 - Article

AN - SCOPUS:84887536439

VL - 88

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 19

M1 - 95115

ER -