Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 103: Spintronics incl. quantum dynamics (MA with HL/TT)

HL 103.3: Vortrag

Freitag, 20. März 2015, 10:15–10:30, EB 202

Electric field as a tool for tuning quantum entanglement in supported clusters — •Oleg O. Brovko, Oleg V. Farberovich, and Valeri S. Stepanyuk — Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany

Electric field has been recently gaining in reputation as a versatile tool for tuning adsorption, electronic and magnetic properties of nanostructures. In the present contribution we show that using this tool it is also possible to tune quantum entanglement of spins in small clusters on metallic surfaces. Relying on a combination of ab initio and Heisenberg-Dirac-Van Vleck quantum spin Hamiltonian calculations we show by the example of a typical transitional metal dimer (Mn) on Ag(001) surface, that in an inherently unentangled system, electric field can "switch on" the entanglement and change its critical temperature parameter by orders of magnitude. The physical mechanism allowing such rigorous control of entanglement by electric field is shown to be the field- induced change in the internal coupling of the supported nanostructure.