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Observation of the two-channel Kondo effect

Author

Listed:
  • R. M. Potok

    (Department of Physics,
    Harvard University, Cambridge, Massachusetts 02138, USA
    Present address: Advanced Micro Devices, Austin, Texas 78741, USA.)

  • 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,)

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.

Suggested Citation

  • R. M. Potok & I. G. Rau & Hadas Shtrikman & Yuval Oreg & D. Goldhaber-Gordon, 2007. "Observation of the two-channel Kondo effect," Nature, Nature, vol. 446(7132), pages 167-171, March.
    • Handle: RePEc:nat:nature:v:446:y:2007:i:7132:d:10.1038_nature05556
    DOI: 10.1038/nature05556
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    Cited by:

    1. R. Žitko & G. G. Blesio & L. O. Manuel & A. A. Aligia, 2021. "Iron phthalocyanine on Au(111) is a “non-Landau” Fermi liquid," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Juan Carlos Estrada Saldaña & Alexandros Vekris & Luka Pavešič & Rok Žitko & Kasper Grove-Rasmussen & Jesper Nygård, 2024. "Correlation between two distant quasiparticles in separate superconducting islands mediated by a single spin," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    3. Lev V. Levitin & Harriet van der Vliet & Terje Theisen & Stefanos Dimitriadis & Marijn Lucas & Antonio D. Corcoles & Ján Nyéki & Andrew J. Casey & Graham Creeth & Ian Farrer & David A. Ritchie & James, 2022. "Cooling low-dimensional electron systems into the microkelvin regime," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    4. Juan Carlos Estrada Saldaña & Alexandros Vekris & Luka Pavešić & Peter Krogstrup & Rok Žitko & Kasper Grove-Rasmussen & Jesper Nygård, 2022. "Excitations in a superconducting Coulombic energy gap," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    5. C. Piquard & P. Glidic & C. Han & A. Aassime & A. Cavanna & U. Gennser & Y. Meir & E. Sela & A. Anthore & F. Pierre, 2023. "Observing the universal screening of a Kondo impurity," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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