An Excited Kondo System

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Science  28 May 2004:
Vol. 304, Issue 5675, pp. 1207
DOI: 10.1126/science.304.5675.1207b

The tunability of mesoscopic devices allows their use as testbeds for studying many-body quantum-mechanical phenomena. One such phenomenon is the Kondo effect, in which an unpaired electron in a quantum dot can mimic magnetic behavior and interact with surrounding electrons. Measurements to date, however, have concentrated on systems under equilibrium conditions. Kogan et al. (p. 1293; see the Perspective by Wingreen) made conductance measurements on a single-electron transistor exposed to microwave excitation. The subsequent development of Kondo satellites confirms a long-standing theoretical prediction and also should allow many-body quantum-mechanical effects to be studied under nonequilibrium (i.e., operational) conditions.

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