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
SN - 1098-0121
VL - 88
JO - Physical Review B: Condensed Matter and Materials Physics
JF - Physical Review B: Condensed Matter and Materials Physics
IS - 19
M1 - 95115
ER -