Journal Article

FZJ-2016-05158

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A chemically driven quantum phase transition in a two-molecule Kondo system

Esat, T.FZJ* ; Lechtenberg, B. ; Deilmann, T. ; Wagner, C.FZJ* ; Krüger, P. ; Temirov, R.FZJ* ; Rohlfing, M. ; Anders, F. B. ; Tautz, F. S. (Corresponding author)FZJ*

2016
Nature Publishing Group Basingstoke

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Please use a persistent id in citations: doi:10.1038/nphys3737

Abstract: 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.

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Contributing Institute(s):

1. Funktionale Nanostrukturen an Oberflächen (PGI-3)
2. John von Neumann - Institut für Computing (NIC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
3. Nonequilibrium dynamics of quantum impurity systems close quantum phase transitions (hhb00_20130501) (hhb00_20130501)
4. Spectra of 2D layered materials (hms17_20140501) (hms17_20140501)

Appears in the scientific report 2016

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 15 ; JCR ; Nationallizenz ; No Authors Fulltext ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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