Abstract
The phenomenology of the ‘0.7 anomaly’ in quantum point contacts is fully explained interms of a quasi-localized state, which forms as the point contact opens up. Detailednumerical calculations within spin-density functional theory do indeed confirm theemergence of such a state. Quantitative calculations of the conductance and the noise areobtained using a model based on these observations, and are in excellent agreement withexisting experimental observations.
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