This title appears in the Scientific Report : 2016 

A chemically driven quantum phase transition in a two-molecule Kondo system
Esat, Taner
Lechtenberg, Benedikt / Deilmann, Thorsten / Wagner, Christian / Krüger, Peter / Temirov, Ruslan / Rohlfing, Michael / Anders, Frithjof B. / Tautz, F. S. (Corresponding author)
Funktionale Nanostrukturen an Oberflächen; PGI-3
John von Neumann - Institut für Computing; NIC
Nature physics, 12 (2016) 9, S. 867 - 873
Basingstoke Nature Publishing Group 2016
10.1038/nphys3737
Journal Article
Spectra of 2D layered materials
Nonequilibrium dynamics of quantum impurity systems close quantum phase transitions
Controlling Configuration-Based Phenomena
Controlling Spin-Based Phenomena
Please use the identifier: http://dx.doi.org/10.1038/nphys3737 in citations.
The magnetic properties of nanostructures that consist of a small number of atoms or molecules are typically determined by magnetic exchange interactions. Here, we show that non-magnetic, chemical interactions can have a similarly decisive effect if spin-moment-carrying orbitals extend in space and therefore allow the direct coupling of magnetic properties to wavefunction overlap and the formation of bonding and antibonding orbitals. We demonstrate this for a dimer of metal–molecule complexes on the Au(111) surface. A changing wavefunction overlap between the two monomers drives the surface-adsorbed dimer through a quantum phase transition from an underscreened triplet to a singlet ground state, with one configuration being located extremely close to a quantum critical point.