CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Cumulene molecular wire conductance from first principles

J. Prasongkit ; A. Grigoriev ; Göran Wendin (Institutionen för mikroteknologi och nanovetenskap, Bionanosystem) ; R. Ahuja
Physical Review B (1098-0121). Vol. 81 (2010), 11,
[Artikel, refereegranskad vetenskaplig]

We present first principles calculations of current-voltage characteristics (IVC) and conductance of Au(111):S-2-cumulene-S-2:Au(111) molecular wire junctions with realistic contacts. The transport properties are calculated using full self-consistent ab initio nonequilibrium Green's function density-functional theory methods under external bias. The conductance of the cumulene wires shows oscillatory behavior depending on the number of carbon atoms (double bonds). Among all conjugated oligomers, we find that cumulene wires with odd number of carbon atoms yield the highest conductance with metalliclike ballistic transport behavior. The reason is the high density of states in broad lowest unoccupied molecular orbital levels spanning the Fermi level of the electrodes. The transmission spectrum and the conductance depend only weakly on applied bias, and the IVC is nearly linear over a bias region of +/- 1 V. Cumulene wires are therefore potential candidates for metallic connections in nanoelectronic applications.

Nyckelord: CARBON-ATOM WIRES, AU(111), CHAINS



Denna post skapades 2011-01-21. Senast ändrad 2011-05-04.
CPL Pubid: 135759

 

Läs direkt!

Lokal fulltext (fritt tillgänglig)

Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Bionanosystem (2007-2015)

Ämnesområden

Fysik
Den kondenserade materiens fysik

Chalmers infrastruktur