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The zero-bias anomaly at low temperatures, originated by the Kondo effectwhen an electric current flows through a system formed by a spin-$1/2$ quantumdot and two metallic contacts is theoretically investigated. In particular, wecompare the width of this anomaly $2T_{\rm NE}$ with that of the Kondoresonance in the spectral density of states $2T_{K}^{\rho}$, obtained from aFano fit of the corresponding curves and also with the Kondo temperature,$T_K^G$, defined from the temperature evolution of the equilibrium conductance$G(T)$. In contrast to $T_K^G$ and $2T_{K}^{\rho}$, we found that the scale$2T_{\rm NE}$ strongly depends on the asymmetry between the couplings of thequantum dot to the leads while the total hybridization is kept constant. Whilethe three scales are of the same order of magnitude, $2T_{\rm NE}$ and$T_{K}^{\rho}$ agree only in the case of large asymmetry between the differenttunneling couplings of the contacts and the quantum dot. On the other hand, forsimilar couplings, $T_{\rm NE}$ becomes larger than $T_{K}^{\rho}$, reachingthe maximum deviation, of the order of $30\%$, for identical couplings. Thefact that an additional parameter to $T_{\rm NE}$ is needed to characterize theKondo effect, weakenig the universality properties, points that some cautionshould be taken in the usual identification in experiments of the lowtemperature width of the zero-bias anomaly with the Kondo scale. Furthermore,our results indicate that the ratios $T_{\rm NE}/T_K^G$ and$T_{K}^{\rho}/T_K^G$ depend on the range used for the fitting.

physical review. b./physical review. b

Relation between width of the zero-bias anomaly and Kondo temperaure in  transport measurements through correlated quantum dots: Effect of asymmetric  coupling to the leads