Frequency dependence of induced spin polarization and spin current in quantum wells

Abstract

Dynamic response of two-dimensional electron systems with spin-orbit interaction is studied theoretically on the basis of quantum kinetic equation, taking into account elastic scattering of electrons. The spin polarization and spin current induced by the applied electric field are calculated for the whole class of electron systems described by p-linear spin-orbit Hamiltonians. The absence of nonequilibrium intrinsic static spin currents is confirmed for these systems with arbitrary (nonparabolic) electron energy spectrum. Relations between the spin polarization, spin current, and electric current are established. The general results are applied to the quantum wells grown in [001] and [110] crystallographic directions, with both Rashba and Dresselhaus types of spin-orbit coupling. It is shown that the existence of the fixed (momentum-independent) precession axes in [001]-grown wells with equal Rashba and Dresselhaus spin velocities or in symmetric [110]-grown wells leads to vanishing spin polarizability at arbitrary frequency of the applied electric field. This property is explained by the absence of Dyakonov-Perel-Kachorovskii spin relaxation for the spins polarized along these precession axes. As a result, a considerable frequency dispersion of spin polarization at very low frequency in the vicinity of the fixed precession axes is predicted. Possible effects of extrinsic spin-orbit coupling on the obtained results are discussed.

14 pages, 6 figures; published with minor corrections in Phys. Rev. B

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Cited by in corpus (13)

• Magneto-gyrotropic effects in semiconductor quantum wells (review)
• Spin dephasing and pumping in graphene due to random spin-orbit interaction
• Theory of current-induced spin polarizations in an electron gas
• Spin orientation by electric current in (110) quantum wells
• Electric field-induced spin textures in a superlattice with Rashba and Dresselhaus spin-orbit coupling
• Dynamic spin-Hall effect and driven spin helix for linear spin-orbit interactions
• Spin Accumulation in Diffusive Conductors with Rashba and Dresselhaus Spin-Orbit Interaction
• Electric-field induced spin excitations in two-dimensional spin-orbit coupled systems
• Theory of inverse Rashba-Edelstein effect induced by spin pumping into a two-dimensional electron gas
• Theory of the inverse Rashba-Edelstein effect induced by thermal spin injection
• Current-induced spin orientation in semiconductors and low-dimensional structures
• Quantum states and linear response in dc and electromagnetic fields for charge current and spin polarization of electrons at Bi/Si interface with giant spin-orbit coupling
• Resonant Edelstein and inverse-Edelstein effects, charge-to-spin conversion, and spin pumping from chiral-spin modes