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Quantum point contacts (QPCs) have shown promise as nanoscale spin-selectivecomponents for spintronic applications and are of fundamental interest in thestudy of electron many-body effects such as the 0.7 x 2e^2/h anomaly. We reporton the dependence of the 1D Lande g-factor g* and 0.7 anomaly on electrondensity and confinement in QPCs with two different top-gate architectures. Weobtain g* values up to 2.8 for the lowest 1D subband, significantly exceedingprevious in-plane g-factor values in AlGaAs/GaAs QPCs, and approaching that inInGaAs/InP QPCs. We show that g* is highly sensitive to confinement potential,particularly for the lowest 1D subband. This suggests careful management of theQPC's confinement potential may enable the high g* desirable for spintronicapplications without resorting to narrow-gap materials such as InAs or InSb.The 0.7 anomaly and zero-bias peak are also highly sensitive to confiningpotential, explaining the conflicting density dependencies of the 0.7 anomalyin the literature.

Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices