Enhanced shot noise of multiple Andreev reflections in a carbon nanotube quantum dot in SU(2) and SU(4) Kondo regimes

Abstract

The sensitivity of shot noise to the interplay between Kondo correlations and superconductivity is investigated in a carbon nanotube quantum dot connected to superconducting electrodes. Depending on the gate voltage, the SU(2) and SU(4) Kondo unitary regimes can be clearly identified. We observe enhancement of the shot noise via the Fano factor in the superconducting state. Its divergence at low bias voltage, which is more pronounced in the SU(4) regime than in the SU(2) one, is larger than what is expected from proliferation of multiple Andreev reflections predicted by the existing theories. Our result suggests that Kondo effect is responsible for this strong enhancement.

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Cited by in corpus (15)

• Shot Noise in Mesoscopic Systems: from Single Particles to Quantum Liquids
• Nonlinear Seebeck effect of SU($N$) Kondo impurity
• Spin-isospin Kondo effects for ${\Sigma }_c$ and ${\Sigma }_c^{\ast }$ baryons and $\bar{D}$ and ${\bar{D}}^{\ast }$ mesons
• Field-induced SU(4) to SU(2) Kondo crossover in a half-filling nanotube dot: spectral and finite-temperature properties
• Three-body correlations in nonlinear response of correlated quantum liquid
• Topologically protected, correlated end spin formation in carbon nanotubes
• Enhanced shot noise at bilayer graphene -- superconductor junction
• Time-dependent Andreev reflection
• Signatures of odd-frequency pairing in the Josephson junction current noise
• Kondo induced π-phase shift of microwave photons in a circuit quantum electrodynamics architecture
• Josephson radiation in a superconductor-quantum dot-superconductor junction
• Collapse of the Josephson emission in a carbon nanotube junction in the Kondo regime
• Strongly correlated electrons in superconducting islands with fluctuating Cooper pairs
• Kondo Temperature Evaluated from Linear Conductance in Magnetic Fields
• Transmission phase evolution in fully screened and overscreened Kondo impurities