We use cotunneling spectroscopy to investigate spin, orbital, and spin-orbital Kondo transport in a strongly confined system of InAs double quantum dots that are parallel coupled to source and drain. In the one-electron transport regime, the higher-symmetry spin-orbital Kondo effect manifests at orbital degeneracy and no external magnetic field. We then proceed to show that the individual Kondo contributions can be isolated and studied separately: either by orbital detuning in the case of spin Kondo transport or by spin splitting in the case of orbital Kondo transport. By varying the interdot tunnel coupling, we show that lifting of the spin degeneracy is key to confirming the presence of an orbital degeneracy and to detecting a small orbital hybridization gap. Finally, in the two-electron regime, we show that the presence of a spin-triplet ground state results in spin Kondo transport at zero magnetic field.

中文翻译：

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平行耦合量子点中自旋轨道近藤贡献的选择性调谐

我们使用共隧道光谱研究在InAs双量子点的强约束系统中的自旋，轨道和自旋轨道近藤输运，该系统平行耦合到源极和漏极。在单电子输运制度中，对称性较高的自旋轨道近藤效应表现为轨道简并且无外部磁场。然后，我们继续表明，可以将单独的近藤贡献进行分离和单独研究：在自旋近藤运输中通过轨道失谐或在近藤轨道运输中通过自旋分裂。通过改变点间隧道耦合，我们显示出自旋简并性的提升对于确认轨道简并性的存在和检测小的轨道杂交间隙至关重要。最后，在二电子体系中