Bipolaronic blockade effect in quantum dots with negative charging energy

Abstract

We investigate single-electron transport through quantum dots with negative charging energy induced by a polaronic energy shift. For weak dot-lead tunnel couplings, we demonstrate a bipolaronic blockade effect at low biases which suppresses the oscillating linear conductance, while the conductance resonances under large biases are enhanced. Novel conductance plateau develops when the coupling asymmetry is introduced, with its height and width tuned by the coupling strength and external magnetic field. It is further shown that the amplitude ratio of magnetic-split conductance peaks changes from 3 to 1for increasing coupling asymmetry. Though we demonstrate all these transport phenomena in the low-order single-electron tunneling regime, they are already strikingly different from the usual Coulomb blockade physics and are easy to observe experimentally.

6 pages, 5 figures

References in corpus (16)

• Spin-orbit qubit in a semiconductor nanowire
• Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
• Orbital Kondo effect in carbon nanotubes
• Electrical generation and absorption of phonons in carbon nanotubes
• Inelastic electron tunneling via molecular vibrations in single-molecule transistors
• Franck-Condon blockade in suspended carbon nanotube quantum dots
• Tunneling in suspended carbon nanotubes assisted by longitudinal phonons
• Tuning the Kondo effect with a mechanically controllable break junction
• Many Body Effects on the Transport Properties of Single-Molecule Devices
• Four-electron shell structures and an interacting two-electron system in carbon nanotube quantum dots
• Pumping of vibrational excitations in a Coulomb blockaded suspended carbon nanotube
• Quantum transport through a deformable molecular transistor
• Three-terminal scanning tunneling spectroscopy of suspended carbon nanotubes
• Nonequilibrium charge-Kondo transport through negative-U molecules
• Pair Tunneling and shot noise through a single molecule in a strong electron-phonon coupling
• Thermal transport of molecular junctions in the pair tunneling regime

Cited by in corpus (6)

• Nonequilibrium Kondo effect by equilibrium numerical renormalization group method: The hybrid Anderson model subject to a finite spin bias
• Approximate exchange-only entangling gates for the three-spin-$1/2$ decoherence-free subsystem
• Strongly correlated electrons in superconducting islands with fluctuating Cooper pairs
• Exact solution of electronic transport in semiconductors dominated by scattering on polaronic impurities
• Electron-electron attraction in an engineered electromechanical system
• Quantum phase transitions in superconductor--quantum-dot--superconductor Josephson structures with attractive intradot interaction