Abstract

We report the observation of a multi‐level Kondo effect resulting from orbital degeneracy in carbon nanotube quantum dots. The orbital degree of freedom plays the role of a pseudospin whose energy splitting is controlled by an applied magnetic field, and it is an order of magnitude larger than the Zeeman splitting. At zero field and low temperature, spin and orbital states form a 4‐fold degenerate shell leading to a highly symmetric Kondo state and a correspondingly high Kondo temperature. At finite magnetic field, a four‐fold splitting of the Kondo resonance is observed due to lifting both spin and orbital degeneracy.

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