Inelastic Kondo-Andreev tunnelings in a vibrating quantum dot

Abstract

Phonon-assisted electronic tunnelings through a vibrating quantum dot embedded between normal and superconducting leads are studied in the Kondo regime. In such a hybrid device, with the bias applied to the normal lead, we find a series of Kondo sidebands separated by half a phonon energy in the differential conductance, which are distinct from the phonon-assisted sidebands previously observed in the conventional Andreev tunnelings and in systems with only normal leads. These Kondo sidebands originate from the Kondo-Andreev cooperative cotunneling mediated by phonons, which exhibit a novel Kondo transport behavior due to the interplay of the Kondo effect, the Andreev tunnelings, and the mechanical vibrations. Our result could be observed in a recent experiment setup [J. Gramich \emph{et al.}, PRL \textbf{115}, 216801 (2015)], provided that their carbon nanotube device reaches the Kondo regime at low temperatures.

Main text: 6 pages, 3 figures; SM: 13 pages, 7 figures. Accepted by PRB Rapid Communication. Disordered references have been corrected

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Cited by in corpus (6)

• Quantum transport through a quantum dot side-coupled to a Majorana bound state pair in the presence of electron-phonon interaction
• Phonon-Assisted Andreev Reflection at Majorana Zero Mode
• Nonequilibrium Kondo effect by equilibrium numerical renormalization group method: The hybrid Anderson model subject to a finite spin bias
• Probing electron-hole weights of an Andreev bound state by transient currents
• Quasiparticles of periodically driven quantum dot coupled between superconducting and normal leads
• Strongly correlated electrons in superconducting islands with fluctuating Cooper pairs