Kondo effect in multielectron quantum dots at high magnetic fields

Abstract

We present a general description of low temperature transport through a quantum dot with any number of electrons at filling factor $1<\nu <2$. We provide a general description of a novel Kondo effect which is turned on by application of an appropriate magnetic field. The spin-flip scattering of carriers by the quantum dot only involves two states of the scatterer which may have a large spin. This process is described by spin-flip Hubbard operators, which change the angular momentum, leading to a Kondo Hamiltonian. We obtain antiferromagnetic exchange couplings depending on tunneling amplitudes and correlation effects. Since Kondo temperature has an exponential dependence on exchange couplings, quantitative variations of the parameters in different regimes have important experimental consequences. In particular, we discuss the {\it chess board} aspect of the experimental conductance when represented in a grey scale as a function of both the magnetic field and the gate potential affecting the quantum dot.

References in corpus (5)

• The Kondo Effect in the Unitary Limit
• Kondo effect in an integer-spin quantum dot
• Enhancement of Kondo effect in quantum dots with an even number of electrons
• Quantum dots with even number of electrons: Kondo effect in a finite magnetic field
• Spin fractionalization of an even number of electrons in a Quantum dot

Cited by in corpus (5)

• Photon-assisted transport in semiconductor nanostructures
• Kondo effect in coupled quantum dots: a Non-crossing approximation study
• Low temperature transport in AC-driven Quantum Dots in the Kondo regime
• Kondo Effect in a Quantum Antidot
• Flux-quantum-modulated Kondo conductance in a multielectron quantum dot