Kondo Effect in a Quantum Antidot

Details Kondo Effect in a Quantum Antidot Kondo Effect in a Quantum Antidot

2002-10-03

arxiv.org/abs/cond-mat/0210084v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 3 figures (Fig.3 in colour), to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.226803

We report Kondo-like behaviour in a quantum antidot (a submicron depleted region in a two-dimensional electron gas) in the quantum-Hall regime. When both spin branches of the lowest Landau level encircle the antidot in a magnetic field ($\sim 1$ T), extra resonances occur between extended edge states via antidot bound states when tunnelling is Coulomb blockaded. These resonances appear only in alternating Coulomb-blockaded regions, and become suppressed when the temperature or source-drain bias is raised. Although the exact mechanism is unknown, we believe that Kondo-like correlated tunnelling arises from skyrmion-type edge reconstruction. This observation demonstrates the generality of the Kondo phenomenon.

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