Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots

Abstract

We study low-temperature transport through carbon nanotube quantum dots in the Coulomb blockade regime coupled to niobium-based superconducting leads. We observe pronounced conductance peaks at finite source-drain bias, which we ascribe to elastic and inelastic cotunneling processes enhanced by the coherence peaks in the density of states of the superconducting leads. The inelastic cotunneling lines display a marked dependence on the applied gate voltage which we relate to different tunneling-renormalizations of the two subbands in the nanotube. Finally, we discuss the origin of an especially pronounced sub-gap structure observed in every fourth Coulomb diamond.

References in corpus (17)

• Supercurrent reversal in quantum dots
• Quantum supercurrent transistors in carbon nanotubes
• A Quantum Dot in the Kondo Regime Coupled to Superconductors
• Multiple Andreev Reflections in a Carbon Nanotube Quantum Dot
• Resonant tunneling through a small quantum dot coupled to superconducting leads
• Critical Current 0-$\pi$ Transition in Designed Josephson Quantum Dot Junctions
• Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
• Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots
• Electron transport in single wall carbon nanotube weak links in the Fabry-Perot regime
• Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
• Kondo resonance enhanced supercurrent in single wall carbon nanotube Josephson junctions
• Resonant multiple Andreev reflections in mesoscopic superconducting junctions
• Andreev reflection versus Coulomb blockade in hybrid semiconductor nanowire devices
• Gate-dependent tunneling-induced level shifts observed in carbon nanotube quantum dots
• Carbon Nanotube Quantum Dots with Nb Contacts
• Gate-controlled superconductivity in diffusive multiwalled carbon nanotube
• Gate-tuned high frequency response of carbon nanotube Josephson junctions

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• Transport Measurement of Andreev Bound States in a Kondo-Correlated Quantum Dot
• Yu-Shiba-Rusinov states in phase-biased S-QD-S junctions
• Josephson current in strongly correlated double quantum dots
• Robust poor man's Majorana zero modes using Yu-Shiba-Rusinov states
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• Nonequilibrium transport through a spinful quantum dot with superconducting leads
• Study of 0-$\pi$ phase transition in hybrid superconductor-InSb nanowire quantum dot devices
• Two-Impurity Yu-Shiba-Rusinov States in Coupled Quantum Dots
• Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots
• Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
• Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic insulator islands
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• Subgap features due to quasiparticle tunneling in quantum dots coupled to superconducting leads
• Surrogate model solver for impurity-induced superconducting subgap states
• Proximity effect in a two dimensional electron gas probed with a lateral quantum dot
• Superconducting Tunneling Spectroscopy of a Carbon Nanotube Quantum Dot
• Subgap resonant quasiparticle transport in normal-superconductor quantum dot devices
• A quantum dot in germanium proximitized by a superconductor
• Inductive microwave response of Yu-Shiba-Rusinov states
• Hard superconducting gap in PbTe nanowires
• Liquid-induced damping of mechanical feedback effects in single electron tunneling through a suspended carbon nanotube
• Charge sensing the parity of an Andreev molecule
• Sub-gap spectroscopy of thermally excited quasiparticles in a Nb contacted carbon nanotube quantum dot
• Erasing odd-parity states in semiconductor quantum dots coupled to superconductors
• Shiba Bound States across the mobility edge in doped InAs nanowires
• Probing Hybridization of a Single Energy Level Coupled to Superconducting Leads
• First order $0/\pi$ quantum phase transition in the Kondo regime of a superconducting carbon nanotube quantum dot
• InAs/MoRe hybrid semiconductor/superconductor nanowire devices
• Thermally induced subgap features in the cotunneling spectroscopy of a carbon nanotube
• A flux-controlled two-site Kitaev chain
• Cotunneling renormalization in carbon nanotube quantum dots
• A particle conserving approach to AC-DC driven interacting quantum dots with superconducting leads
• Josephson junctions based on ultraclean carbon nanotubes
• Gate-tunable negative differential conductance in hybrid semiconductor-superconductor devices
• Enhanced negative nonlocal conductance in an interacting quantum dot connected to two ferromagnetic leads and one superconducting lead
• Andreev molecule in parallel InAs nanowires
• Wideband superconducting nanotube electrometer