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

Journal of Magnetics, Volume 15, Number 1, 31 Mar 2010, Pages 7-11

Jae-Seung Jeong *

(Department of Physics and PCTP, Pohang University of Science and Technology), Hyun-Woo Lee (Department of Physics and PCTP, Pohang University of Science and Technology)

Abstract

Spin-orbit coupling (SOC) 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.

Keywords: spin-orbit coupling; quantum point contact; spin dephasing

DOI: 10.4283/JMAG.2010.15.1.007

Full Text: PDF

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