Observation of the Kondo effect in a spin-3/2 hole quantum dot |
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Authors: | Klochan O Micolich A P Hamilton A R Trunov K Reuter D Wieck A D |
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Affiliation: | School of Physics, University of New South Wales, Sydney, Australia. klochan@phys.unsw.edu.au |
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Abstract: | We report the observation of Kondo physics in a spin-3/2 hole quantum dot. The dot is formed close to pinch-off in a hole quantum wire defined in an undoped AlGaAs/GaAs heterostructure. We clearly observe two distinctive hallmarks of quantum dot Kondo physics. First, the Zeeman spin splitting of the zero-bias peak in the differential conductance is independent of the gate voltage. Second, this splitting is twice as large as the splitting for the lowest one-dimensional subband. We show that the Zeeman splitting of the zero-bias peak is highly anisotropic and attribute this to the strong spin-orbit interaction for holes in GaAs. |
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