Parity oscillations of Kondo temperature in a single molecule break junction

Abstract

We study the Kondo temperature (TK) of a single molecule break junction. By employing a numerical renormalization group calculations we have found that TK depends dramatically upon the position of the molecule in the wire formed between the contacts. We show that TK exhibits strong oscillations when the parity of the left and/or right number of atomic sites (NL,NR) is changed. For a given set of parameters, the maximum value of TK occurs for (odd, odd) combination, while its minimum value is observed for (even, even). These oscillations are fully understood in terms of the effective hybridization function.