Electron transport in a model magnetic system: a Co atom between two Cu electrodes

C. GARCIA; N. LORENTE; D-J CHOI; P. N. ABUFAGER; L. LIMOT

Conferencia; QMOL conference; 2017

Diluted Co impurities in a copper substrate is a classical Kondo system. Here we study a single Co atom between two copper electrodes using non-equilibrium Green?s functions and the non-crossing approximation to evaluate electron transport in the presence of Kondo physics. We discuss the effects of different levels of sophistication of the calculations for the electronic structure. The spin-flip probabilities due to the Kondo effect and to the intrinsic spin-orbit coupling are evaluated [1]. The non-equilibrium setup leads to enhanced decoherence ofthe Kondo peak, but the conductance faithfully reflects the Kondo temperature even at strong coupling with the electrodes [2]. The theoretical results are compared to experimental data obtained by contacting a Co adsorbate on Cu(100) by a Cu-covered scanning tunneling microscope tip [2-4].References:[1] C. García, P. Abugafer, N. Lorente, submitted.[2] Deung-Jang Choi, Paula Abufager, Laurent Limot, Nicolás Lorente, J. Chem.Phys. 146, 092309 (2017)[3] Deung-Jang Choi, M. V. Rastei, P. Simon and L. Limot, Phys. Rev. Lett. 108,266803 (2012)[4] Deung-Jang Choi, et al., Nano Letters 16, 6298 (2016).