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

Abstract

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.

9 pages, 4 figures

References in corpus (4)

• Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
• All-Electric Quantum Point Contact Spin Valve
• Decoherence of transported spin in multichannel spin-orbit coupled spintronic devices: Scattering approach to spin density matrix from the ballistic to the localized regime
• Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot