Exact Density-Functional Potentials for Time-Dependent Quasiparticles

Research output: Contribution to journalArticlepeer-review

Abstract

We calculate the exact Kohn-Sham potential that describes, within time-dependent density-functional theory, the propagation of an electron quasiparticle wave packet of nonzero crystal momentum added to a ground-state model semiconductor. The potential is observed to have a highly nonlocal functional dependence on the charge density, in both space and time, giving rise to features entirely lacking in local or adiabatic approximations. The dependence of the nonequilibrium part of the Kohn-Sham electric field on the local current and charge density is identified as a key element of the correct Kohn-Sham functional.

Original languageEnglish
Article number036402
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Volume109
Issue number3
DOIs
Publication statusPublished - 16 Jul 2012

Cite this