Kondo Effects in Quantum Point Contacts

The conductance through a quantum point contact exhibits integer steps of G_0=2e²/h. In addition, one observes an additional shoulder at a value around 0.7xG_0, an observation which has be fully explained in terms of a quasi-localized state, which forms as the point contact opens up. I will discuss the Kondo like features that have been seen and that are predicted to occur due to such localized states.