Observation of the two-channel Kondo effect

R. M. Potok, I. G. Rau, Hadas Shtrikman, Yuval Oreg and D. Goldhaber-Gordon ()
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R. M. Potok: Department of Physics,
I. G. Rau: Stanford University, Stanford, California 94305, USA
Hadas Shtrikman: Weizmann Institute of Science, Rehovot 96100, Israel
Yuval Oreg: Weizmann Institute of Science, Rehovot 96100, Israel
D. Goldhaber-Gordon: Department of Physics,

Nature, 2007, vol. 446, issue 7132, 167-171

Abstract: It takes two to Kondo Semiconductor quantum dots — nano-structures that tightly confine the motion of electrons — have emerged as useful model systems for studying and manipulating the behaviour of one or a few electrons. One of the best-studied phenomena is the Kondo effect, where an isolated electron spin in a quantum dot strongly interacts with the sea of electrons in the electrodes, giving rise to a complex many-particle state. A subtly different phenomenon that is much more difficult to observe is the two-channel Kondo effect, where electrons in two electrodes are entangled with each other via their interaction with a single localized spin in a quantum dot. Unlike the conventional Kondo effect, this new effect cannot be described within the conventional picture for electron behaviour of Fermi liquids. The much sought-after two-channel Kondo effect has now been observed in quantum dots, over 25 years after it was first predicted. The system is minutely controllable at the microscopic level — a step towards the ultimate designer semiconductor nanostructure.

Date: 2007
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DOI: 10.1038/nature05556

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