Jinhong Park, S. -S. B. Lee, Yuval Oreg, H. -S. Sim
We propose a method to directly measure, by electrical means, the Kondo screening cloud formed by an Anderson impurity coupled to semi-infinite quantum wires, on which an electrostatic gate voltage is applied at distance L from the impurity. We show that the Kondo cloud, and hence the Kondo temperature and the electron conductance through the impurity, are affected by the gate voltage, as L ecreases below the Kondo cloud length. Based on this behavior, the cloud length can be experimentally identified by changing L with a keyboard type of gate voltages or tuning the coupling strength between the impurity and the wires.
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http://arxiv.org/abs/1210.6138
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