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

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