Spin relaxation in narrow wires of a two-dimensional electron gas

Schwab, Peter; Dzierzawa, Michael; Gorini, Cosimo; Raimondi, Roberto

doi:10.1103/physrevb.74.155316

Cited by 43 publications

(62 citation statements)

References 28 publications

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“…Further we present the linearized result with respect to the spin-orbit coupling. A nonlinear analytic result with some more drastic simplifications can be found in 86 . The collisions are responsible for the damping of this oscillatory motion.…”

Section: Dielectric Functionmentioning

confidence: 99%

Kinetic theory of spin-polarized systems in electric and magnetic fields with spin-orbit coupling. II. RPA response functions and collective modes

Morawetz

2015

Phys. Rev. B

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The spin and density response functions in the random phase approximation (RPA) are derived by linearizing the kinetic equation including a magnetic field, the spin-orbit coupling, and mean fields with respect to an external electric field. Different polarization functions appear describing various precession motions showing Rabi satellites due to an effective Zeeman field. The latter turns out to consist of the mean-field magnetization, the magnetic field, and the spin-orbit vector. The collective modes for charged and neutral systems are derived and a threefold splitting of the spin waves dependent on the polarization and spin-orbit coupling is shown. The dielectric function including spin-orbit coupling, polarization and magnetic fields is presented analytically for long wave lengths and in the static limit. The dynamical screening length as well as the long-wavelength dielectric function shows an instability in charge modes, which are interpreted as spin segregation and domain formation. The spin response describes a crossover from damped oscillatory behavior to exponentially damped behavior dependent on the polarization and collision frequency. The magnetic field causes ellipsoidal trajectories of the spin response to an external electric field and the spin-orbit coupling causes a rotation of the spin axes. The spin-dephasing times are extracted and discussed in dependence on the polarization, magnetic field, spin-orbit coupling and single-particle relaxation times.

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Section: Dielectric Functionmentioning

confidence: 99%

Kinetic theory of spin-polarized systems in electric and magnetic fields with spin-orbit coupling. II. RPA response functions and collective modes

Morawetz

2015

Phys. Rev. B

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“…4 and 8. More generally, the relaxation of the spin helix is an example of situations [1][2][3][4][5][9][10][11][12][13][14][15][16][17][18] in which the electron spin relaxation scenario deviates from the predictions of D'yakonov-Perel' theory. 19 Experimentally, the spin-grating technique 20 is typically used 3,5 to create spin helical configurations in semiconductors.…”

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confidence: 99%

Spontaneous emergence of a persistent spin helix from homogeneous spin polarization

2011

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We demonstrate that a homogeneous spin polarization in one-dimensional structures of finite length in the presence of Bychkov-Rashba spin-orbit coupling decays spontaneously toward a persistent spin helix. The analysis of formation of spin helical state is presented within a novel approach based on a mapping of spin drift-diffusion equations into a heat equation for a complex field. Such a strikingly different and simple method allows generating robust spin structures whose properties can be tuned by the strength of the spin orbit interaction and/or structure's length. We generalize our results for two-dimensional case predicting formation of persistent spin helix in two-dimensional channels from homogeneous spin polarization.

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“…This became possible after the formulation of boundary conditions, including hybrid structures and interface roughness [5,6,7]. In recent developments we focussed on spin-effects and spatial confinement, e.g., concerning the spin-Hall effect in a 2D electron gas [8], and spin relaxation in narrow wires in the presence of spin-orbit coupling [9]. Within the quasiclassical approach, it is also possible to study the influence of disorder and Coulomb interaction on the same footing [10,11], which is manageable since the method works on an intermediate level: microscopic details of the wave-functions, on the scale of the interatomic distance, are integrated out, leaving equations of motion which can be solved with sufficient accuracy.…”

Section: Introductionmentioning

confidence: 99%

Quasiclassical theory of electronic transport in mesoscopic systems: Luttinger liquids revisited

Eckern¹,

Schwab

2007

Physica Status Solidi (b)

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The method of the quasiclassical Green's function is used to determine the equilibrium properties of onedimensional (1D) interacting Fermi systems, in particular, the bulk and the local (near a hard wall) density of states. While this is a novel approach to 1D systems, our findings do agree with standard results for Luttinger liquids obtained with the bosonization method. Analogies to the so-called P (E) theory of tunneling through ultrasmall junctions are pointed out and are exploited. Further applications of the Green's function method for 1D systems are discussed.

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Spin relaxation in narrow wires of a two-dimensional electron gas

Cited by 43 publications

References 28 publications

Kinetic theory of spin-polarized systems in electric and magnetic fields with spin-orbit coupling. II. RPA response functions and collective modes

Kinetic theory of spin-polarized systems in electric and magnetic fields with spin-orbit coupling. II. RPA response functions and collective modes

Spontaneous emergence of a persistent spin helix from homogeneous spin polarization

Quasiclassical theory of electronic transport in mesoscopic systems: Luttinger liquids revisited

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