A quantum dot, as its name implies, is a minuscule region of metallic or semiconductor material whose dimensions can be as small as a few tens of nanometers on a side. It has been likened to an artificial atom because it carries a discrete charge and quantized electronic energy levels (see the article by Marc Kastner in PHYSICS TODAY, January 1993, page 24). That analogy has now been taken a step further with the demonstration that a quantum dot interacts with nearby metallic leads in much the same way that a single magnetic impurity interacts with a surrounding metallic substance—in the phenomenon known as the Kondo effect.
Kondo Physics Seen in a Quantum Dot
Barbara Goss Levi; Kondo Physics Seen in a Quantum Dot. Physics Today 1 January 1998; 51 (1): 17–18. https://doi.org/10.1063/1.882089
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