Ryan Requist

Ferromagnetic Kondo Effect in a Triple Quantum Dot System

A simple device of three laterally coupled quantum dots, the central one contacted by metal leads, provides a realization of the ferromagnetic Kondo model, which is characterized by interesting properties like a nonanalytic inverted zero-bias anomaly and an extreme sensitivity to a magnetic field. Tuning the gate voltages of the lateral dots allows us to study the transition from a ferromagnetic to antiferromagnetic Kondo effect, a simple case of a Berezinskii-Kosterlitz-Thouless transition. We model the device by three coupled Anderson impurities that we study by numerical renormalization group. We calculate the single-particle spectral function of the central dot, which at zero frequency is proportional to the zero-bias conductance, across the transition, both in the absence and in the presence of a magnetic field.

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Co adatoms on Cu surfaces: ballistic conductance and Kondo temperature

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Spin-orbit interaction and Dirac cones ind-orbital noble metal surface states

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Double occupancy errors in quantum computing operations : Corrections to adiabaticity

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Hamiltonian formulation of nonequilibrium quantum dynamics: Geometric structure of the Bogoliubov-Born-Green-Kirkwood-Yvon hierarchy

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Asymptotic analysis of the Berry curvature in the E⊗e Jahn-Teller model

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Magnetic impurities in nanotubes: From density functional theory to Kondo many-body effects

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Density functional theory of electron transfer beyond the Born-Oppenheimer approximation: Case study of LiF

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Energy-momentum mapping of d-derived Au(111) states in a thin film

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