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Article Dans Une Revue physica status solidi (RRL) - Rapid Research Letters Année : 2016

Spin-orbit stiffness of the spin-polarized electron gas

Résumé

In a spin-polarized electron gas, Coulomb interaction couples the spin and motion degrees of freedom to build propagating spin waves. The spin-wave stiffness Ssw quantifies the energy cost to trigger such excitation by perturbing the kinetic energy of the electron gas (i. e. putting it in motion). Here we introduce the concept of spin-orbit stiffness, Sso, as the energy necessary to excite a spin wave with a spin polarization induced by spin-orbit coupling. This quantity governs the Coulombic enhancement of the spin-orbit field acting of the spin wave. First-principles calculations and electronic Raman scattering experiments carried out on a model spin-polarized electron gas, embedded in a CdMnTe quantum well, demonstrate that Sso = Ssw. Through optical gating of the structure, we demonstrate the reproducible tuning of Sso by a factor of 3, highlighting the great potential of spin-orbit control of spin waves in view of spintronics applications.
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Dates et versions

hal-01331125 , version 1 (13-06-2016)

Identifiants

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Florent Baboux, Florent Perez, C. A. Ullrich, G. Karczewski, T. Wojtowicz. Spin-orbit stiffness of the spin-polarized electron gas. physica status solidi (RRL) - Rapid Research Letters, 2016, 10 (4), pp.315-319. ⟨10.1002/pssr.201600032⟩. ⟨hal-01331125⟩
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