Resonant and inelastic Andreev tunneling observed on a carbon nanotube quantum dot

Abstract

We report the observation of two fundamental sub-gap transport processes through a quantum dot (QD) with a superconducting contact. The device consists of a carbon nanotube contacted by a Nb superconducting and a normal metal contact. First, we find a single resonance with position, shape and amplitude consistent with the theoretically predicted resonant Andreev tunneling (AT) through a single QD level. Second, we observe a series of discrete replicas of resonant AT at a separation of $\sim 145\mu$eV, with a gate, bias and temperature dependence characteristic for boson-assisted, inelastic AT, in which energy is exchanged between a bosonic bath and the electrons. The magnetic field dependence of the replica's amplitudes and energies suggest that two different bosons couple to the tunnel process.

5 pages + 9 pages supplementary material

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Cited by in corpus (34)

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• Two-Impurity Yu-Shiba-Rusinov States in Coupled Quantum Dots
• Cooper-pair splitting in two parallel InAs nanowires
• Spectroscopy of the superconducting proximity effect in nanowires using integrated quantum dots
• Ground-State Cooling of a Mechanical Oscillator by Interference in Andreev Reflection
• Realization of a Carbon-Nanotube-Based Superconducting Qubit
• Engineering the Floquet spectrum of superconducting multiterminal quantum dots
• Photon-assisted resonant Andreev reflections: Yu-Shiba-Rusinov and Majorana states
• Current cross-correlations in double quantum dot based Cooper pair splitters with ferromagnetic leads
• Single atom laser in normal-superconductor quantum dots
• Superconducting contacts to a monolayer semiconductor
• Kondo physics in double quantum dot based Cooper pair splitters
• Quantum transport through a quantum dot side-coupled to a Majorana bound state pair in the presence of electron-phonon interaction
• Current cross-correlations and waiting time distributions in Andreev transport through Cooper pair splitters based on triple quantum dots
• Topology and zero energy edge states in carbon nanotubes with superconducting pairing
• Highly symmetric and tunable tunnel couplings in InAs/InP nanowire heterostructure quantum dots
• Subgap resonant quasiparticle transport in normal-superconductor quantum dot devices
• Full counting statistics of phonon-assisted Andreev tunneling through a quantum dot coupled to normal and superconducting leads
• Ultralong-distance quantum correlations in three-terminal Josephson junctions
• Charge-vibration interaction effects in normal-superconductor quantum dots
• Phonon-Assisted Andreev Reflection at Majorana Zero Mode
• Intermediate states in Andreev bound state fusion
• Quasiparticles of periodically driven quantum dot coupled between superconducting and normal leads
• Inelastic Kondo-Andreev tunnelings in a vibrating quantum dot
• Full characterization of a carbon nanotube parallel double quantum dot
• Single-photon pump by Cooper-pair splitting
• Zero energy states clustering in an elemental nanowire coupled to a superconductor
• Nano-mechanics driven by Andreev tunneling
• Supercurrent from the imaginary part of the Andreev levels in non-Hermitian Josephson junctions
• Cooling of nanomechanical vibrations by Andreev injection
• Ground state cooling of nanomechanical resonators by electron transport
• Pumping and cooling of nanomechanical vibrations generated by Cooper pair exchange