The role of spin-flip assisted or orbital mixing tunneling on transport through strongly correlated multilevel quantum dot

TL;DR

This paper investigates how spin-flip and orbital mixing tunneling processes affect electron transport in strongly correlated multilevel quantum dots, revealing new interference effects and resonance behaviors.

Contribution

It introduces analytical expressions for conductance and thermopower in N-level quantum dots considering symmetry-breaking tunneling processes.

Findings

Discovery of antibonding Dicke-like and bonding Kondo-like resonances.

Analytical formulas for conductance and thermopower for arbitrary N.

Comparison of symmetric and symmetry-broken Kondo resonances.

Abstract

Using the slave boson Kotliar-Ruckenstein approach (SBMFA) for N level Anderson model, we compare fully symmetric SU(N) Kondo resonances occurring for spin and orbital conserving tunneling with many-body resonances for the dot with broken symmetry caused by spin, orbital or full spin-orbital mixing. As a result of interorbital or spin flip processes new interference paths emerge, which manifests in the occurrence of antibonding Dicke like and bonding Kondo like resonances. The analytical expressions for linear conductances and linear temperature thermopower coefficient for arbitrary N are found.