The theory of the "0.7 anomaly" in quantum point contacts

Details The theory of the "0.7 anomaly" in quantum point contacts The theory of the "0.7 anomaly" in quantum point contacts

2007-10-17

arxiv.org/abs/0710.3307v1

J. Phys.: Condens. Matter 20 (2008) 164208

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

A summary paper, to be included in JPCM Special Issue on 0.7 Feature

Scientific paper

10.1088/0953-8984/20/16/164208

The phenomenology of the "0.7 anomaly" in quantum point contacts is fully explained in terms of a quasi-localized state, which forms as the point contact opens up. Detailed numerical calculations within spin-density functional theory indeed con rm the emergence of such a state. Quantitative calculations of the conductance and the noise are obtained using a model based on these observations, and are in excellent agreement with existing experimental observations.

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