78 citations · 168 across the 8 of their papers we have counts for
8 papers
Odd and even Kondo effects from emergent localisation in quantum point contacts
M. J. Iqbal, Roi Levy, E. J. Koop +8
A quantum point contact (QPC) is a very basic nano-electronic device: a short and narrow transport channel between two electron reservoirs. In clean channels electron transport is…
Spin-dephasing anisotropy for electrons in a diffusive quasi-1D GaAs wire
J. Liu, T. Last, E. J. Koop +3
We present a numerical study of dephasing of electron spin ensembles in a diffusive quasi-one-dimensional GaAs wire due to the D'yakonov-Perel' spin-dephasing mechanism. For widths…
The annealing mechanism of AuGe/Ni/Au ohmic contacts to a two-dimensional electron gas in GaAs/AlGaAs heterostructures
E. J. Koop, M. J. Iqbal, F. Limbach +6
Ohmic contacts to a two-dimensional electron gas (2DEG) in GaAs/AlGaAs heterostructures are often realized by annealing of AuGe/Ni/Au that is deposited on its surface. We studied h…
Confinement-enhanced spin relaxation for electron ensembles in large quantum dots
E. J. Koop, B. J. van Wees, C. H. van der Wal
We present a numerical study of spin relaxation in a semiclassical electron ensemble in a large ballistic quantum dot. The dot is defined in a GaAs/AlGaAs heterojunction system wit…
Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot
E. J. Koop, B. J. van Wees, D. Reuter +2
We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection was achieved wi…
The influence of device geometry on many-body effects in quantum point contacts: Signatures of the 0.7 anomaly, exchange and Kondo
E. J. Koop, A. I. Lerescu, J. Liu +4
The conductance of a quantum point contact (QPC) shows several features that result from many-body electron interactions. The spin degeneracy in zero magnetic field appears to be s…