Spin Bias Measurement Based on a Quantum Point Contact

Details Spin Bias Measurement Based on a Quantum Point Contact Spin Bias Measurement Based on a Quantum Point Contact

2008-11-11

arxiv.org/abs/0811.1608v1

Appl. Phys. Lett. 93, 142107 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures

Scientific paper

10.1063/1.2999587

Electron charge transport through a quantum point contact (QPC) driven by an asymmetric spin bias is studied. A large charge current is induced when the transmission coefficient of the QPC jumps from one integer plateau to the next. Furthermore, for an open external circuit, the induced charge bias instead of the charge current is found to be quite large. It provides an efficient and practical way to detect spin bias by using a very simple device, a QPC or a STM tip. In addition, with the aid of magnetic field, polarization direction of the spin bias can also be determined.

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