Journal of Physics - condensed matter

The theory of the ‘0.7 anomaly’ in quantum point contacts

  • Yigal Meir

  • Physics Department, Ben Gurion University, Beer Sheva 84105, Israel
2008 J. Phys.: Condens. Matter 20 164208doi: 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 do indeed confirm 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.