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The Kondo effect is a strong correlation non-perturbative emergent
phenomenon. It was first discovered in the bulk by analyzing magnetic
impurities embedded in normal metal. With the progress of nanodevice
fabrication a renewed interest in Kondo physics has been rekindled. To
obtain reliable quantitative predictions for such experiments, unbiased
numerical simulations such as various variants of quantum Monte Carlo
(QMC), or numerical renormalization group (NRG) are widely used.
In this talk, I will give a brief introduction into the applications of
Renormalization group techniques to continuous phase transitions. Later,
a solution of a magnetically tunable Kondo effect by using numerical
Renormalization group is shown. The obtained results are carefully
compared to the experimental data obtained in a corresponding nanodevice
investigated in the group of prof. Van der Zant at TU Delft.