Observation of the SU(4) Kondo state in a double quantum dot

Abstract

Central to condensed matter physics are quantum impurity models, which describe how a local degree of freedom interacts with a continuum. Surprisingly, these models are often universal in that they can quantitatively describe many outwardly unrelated physical systems. Here we develop a double quantum dot-based experimental realization of the SU(4) Kondo model, which describes the maximally symmetric screening of a local four-fold degeneracy. As demonstrated through transport measurements and detailed numerical renormalization group calculations, our device affords exquisite control over orbital and spin physics. Because the two quantum dots are coupled only capacitively, we can achieve orbital state- or "pseudospin"-resolved bias spectroscopy, providing intimate access to the interplay of spin and orbital Kondo effects. This cannot be achieved in the few other systems realizing the SU(4) Kondo state.

Text and supplementary information. Text: 17 pages, 4 figures. Supplementary information: 24 pages, 9 figures

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• Kondo physics in tunable semiconductor nanowire quantum dots
• Correlated electron tunneling through two separate quantum dot systems with strong capacitive interdot coupling
• Transport through a quantum dot with SU(4) Kondo entanglement
• Renormalization group study of capacitively coupled double quantum dots
• Full electrostatic control over polarized currents through spin-orbital Kondo effect
• Manual for the Flexible DM-NRG code
• Analysis of low energy response and possible emergent SU(4) Kondo state in a double quantum dot

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