Quantum Many-Body Effects in a Single-Electron Transistor

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Science  28 May 2004:
Vol. 304, Issue 5675, pp. 1258-1259
DOI: 10.1126/science.1098302

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When a single electron spin interacts quantum mechanically with a metallic sea of electrons, a phenomenon called the Kondo scattering resonance can be observed. In his Perspective, Wingreen discusses results reported in this issue by Kogan et al. in which a spectroscopic technique involving microwave excitation of a single-electron transistor is used to study the Kondo resonance. The development of this technique promises a new window into quantum many-body effects in other nanostructures.