Suppression of Spin Dephasing in a Two-Dimensional Electron Gas with a Quantum Point Contact

Details Suppression of Spin Dephasing in a Two-Dimensional Electron Gas with a Quantum Point Contact Suppression of Spin Dephasing in a Two-Dimensional Electron Gas with a Quantum Point Contact

2010-04-07

arxiv.org/abs/1004.1006v2

J. Magnet. 15, 7 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 4 figures

Scientific paper

10.4283/JMAG.2010.15.1.007

Spin-orbit coupling is a source of strong spin dephasing in two- and three-dimensional semiconducting systems. We report that spin dephasing in a two-dimensional electron gas can be suppressed by introducing a quantum point contact. Surprisingly, this suppression was not limited to the vicinity of the contact but extended to the entire two-dimensional electron gas. This facilitates the electrical control of the spin degree of freedom in a two-dimensional electron gas through spin-orbit coupling.

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