Can I read The failure of DFT-based computations for a stepped-substrate-supported correlated Co wire on EtoBox?

The failure of DFT-based computations for a stepped-substrate-supported correlated Co wire by Zaki, Nader; Park, Hyowon; Osgood, Richard M.; Millis, Andrew J.; Marianetti, Chris A. is a scholarly article available to read on EtoBox.

What is The failure of DFT-based computations for a stepped-substrate-supported correlated Co wire about?

Density functional theory (DFT) has been immensely successful in its ability to predict physical properties, and, in particular, structures of condensed matter systems. Here, however, we show that DFT qualitatively fails to predict the dimerized structural phase for a monatomic Co wire that is self-assembled on a vicinal, i.e. stepped, Cu(111) substrate. To elucidate the nature of this failure, we compute the energetics of a Co chain on a Cu surface, step, notch, and embedded in bulk. The results demonstrate that increasing Co coordination extinguishes the dimerization, indicating that the failure of DFT for Co on the Cu step arises from excessive hybridization, which both weakens the ferromagnetic correlations that drive the dimerization and increases the bonding that opposes dimerization. Additionally, we show that including local interactions via DFT+U or DFT+DMFT does not restore the dimerization for the step-substrate supported wire, though the Co wire does dimerize in DFT+DMFT for the isolated vacuum case. This system can serve as a benchmark for future electronic structure methods.

Author

Zaki, Nader; Park, Hyowon; Osgood, Richard M.; Millis, Andrew J.; Marianetti, Chris A.

Published

2013

Language

EN