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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 74: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 74.8: Talk

Wednesday, April 2, 2014, 17:00–17:15, BEY 81

The Kondo effect in atomic chains — •Deung-Jang Choi1,2, Shichao Yan1,2, Jacob Burgess1,2, Steffen Rolf-Pissarczyk1,2, and Sebastian Loth1,21Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany — 2Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany

We can construct atomic model structures to engineer Spin Hamiltonians using a sub-Kelvin scanning tunneling microscope (STM). For that, different kinds of transition metal atoms were manipulated and construction of atomic chains was performed. The chains composed of transition metal atoms form a highly correlated spin singlet ground state exhibiting a Kondo resonance. We studied temperature and magnetic field dependence to confirm the Kondo effect in this composite magnetic system. It is revealed that the occurrence of the Kondo resonance sensitively depends on the length of the atomic chain and the spin anisotropy energy of each atom. We build chains with different elemental composition and obtain various spin ground states. In this way, we can tailor the singlet ground state on and off. Such composite magnetic chains present a fruitful experimental model spin system and make it possible to engineer prototypical correlated spin states at atomic dimensions.

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