Abrupt disappearance and reemergence of the SU(2) and SU(4) Kondo effects due to population inversion

Abstract

The interplay of almost degenerate levels in quantum dots and molecular junctions with possibly different couplings to the reservoirs has lead to many observable phenomena, such as the Fano effect, transmission phase slips and the SU(4) Kondo effect. Here we predict a dramatic repeated disappearance and reemergence of the SU(4) and anomalous SU(2) Kondo effects with increasing gate voltage. This phenomenon is attributed to the level occupation switching which has been previously invoked to explain the universal transmission phase slips in the conductance through a quantum dot. We use analytical arguments and numerical renormalization group calculations to explain the observations and discuss their experimental relevance and dependence on the physical parameters.

7 plots in 4 figures

References in corpus (13)

• Orbital Kondo effect in carbon nanotubes
• Highly conductive molecular junctions based on direct binding of benzene to platinum electrodes
• SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum Dots
• Electronic Transport Spectroscopy of Carbon Nanotubes in a Magnetic Field
• Zero-bias conductance in carbon nanotube quantum dots
• Unified description of correlations in double quantum dots
• Mesoscopic to universal crossover of transmission phase of multi-level quantum dots
• Correlated electron tunneling through two separate quantum dot systems with strong capacitive interdot coupling
• Transmission phase of a singly occupied quantum dot in the Kondo regime
• Transport through a quantum dot with SU(4) Kondo entanglement
• Conditions for observing emergent SU(4) symmetry in a double quantum dot
• Restoring the SU(4) Kondo regime in a double quantum dot system
• Level-occupation switching of the Quantum Dot, and phase anomalies in mesoscopic interferometry

Cited by in corpus (10)

• Kondo effect and spin-orbit coupling in graphene quantum dots
• Nonlinear Seebeck effect of SU($N$) Kondo impurity
• Field-induced SU(4) to SU(2) Kondo crossover in a half-filling nanotube dot: spectral and finite-temperature properties
• Manipulability of the Kondo effect in a T-shaped triple-quantum-dot structure
• Width of the charge-transfer peak in the SU(N) impurity Anderson model and its relevance to non-equilibrium transport
• Exchange-correlation potentials for multi-orbital quantum dots subject to generic density-density interactions and Hund's rule coupling
• Effects of strong electron interactions and resonance scattering on power output of nano-devices
• Level occupation switching with density functional theory
• Unraveling screening mechanisms in Kondo impurities using an NRG-MPS-based method
• Transmission phase evolution in fully screened and overscreened Kondo impurities