Spin relaxation of two-dimensional electrons in a hall ferromagnet

Nefyodov, Yu. A.; Fortunatov, A. A.; Shchepetilnikov, A. V.; Кукушкин, И. В.

doi:10.1134/s0021364010070076

Cited by 22 publications

(12 citation statements)

References 7 publications

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“…This may be estimated by observation of the resonance linewidths: for example, the spin-wave lifetime was deduced from the observed width of the electron spin resonance lines. 5 Microwave and optical linewidths are not, however, directly related to the lifetime and usually provide only a very rough lower bound for this quantity. In consequence, one is forced to use combined experimental methods, including a time-resolved technique (see, e.g., Ref.…”

Section: Introductionmentioning

confidence: 99%

Competing hyperfine and spin-orbit couplings: Spin relaxation in a quantum Hall ferromagnet

Dickmann

Ziman

2012

Phys. Rev. B

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We measure the spin-resolved transport of dipolar excitons in a biased GaAs double quantum well structure. From these measurements we extract both spin lifetime and mobility of the excitons. We find that below a temperature of 4.8K, there is a sharp increase in the spin lifetime of the excitons, together with a sharp reduction in their mobility. At T = 1.5K, where the excitons have the lowest mobility, we observe an anomalous non-monotonous dependence of the exciton spin lifetime on the mobility. Below a critical power the spin lifetime increases with increasing mobility and density, while above the critical power the opposite trend is observed. We interpret this transition as an evidence of the interplay between two different spin dephasing mechanisms: at low mobility the dephasing is dominated by the hyperfine interaction with the lattice nuclei spins, while at higher mobility the spin-orbit interaction dominates, and a Dyakonov-Perel spin relaxation takes over. The excitation power and temperature regime where the hyperfine interaction induced spin dephasing is observed correlates with the regime where a dark dipolar quantum liquid was reported recently on a similar sample.

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Section: Introductionmentioning

confidence: 99%

Competing hyperfine and spin-orbit couplings: Spin relaxation in a quantum Hall ferromagnet

Dickmann

Ziman

2012

Phys. Rev. B

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“…Surprisingly, despite the fact that transport, optical, and magnetic phenomena in a 2DES in perpendicular magnetic fields are well studied due to the integer and fractional quantum Hall effects, spin relaxation physics are not well understood. Experimentally observed spin relaxation times vary from ∼ 1 ns [4] to ∼ 10 ns [5,6] and do not provide a definite clue for identifying the major process governing the relaxation of spins. Theoretical advances are more prominent; yet without a proper experimental background these advances are characterized by a diversity of studied relaxation mechanisms [7][8][9] leading to a wide range of calculated relaxation times.…”

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confidence: 99%

Slow spin relaxation in a quantum Hall ferromagnet state

et al. 2014

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Electron spin relaxation in a spin-polarized quantum Hall state is studied. Long spin relaxation times that are at least an order of magnitude longer than those measured in previous experiments were observed and explained within the spin-exciton relaxation formalism. Absence of any dependence of the spin relaxation time on the electron temperature and on the spin-exciton density, and specific dependence on the magnetic field indicate the definite relaxation mechanism -- spin-exciton annihilation mediated by spin-orbit coupling and smooth random potential.Comment: 5 two-column pages, 3 figure

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“…The analysis of the experimental data from Refs. [11][12][13] shows that the contributions to the g-factor anisotropy from the quantum well interfaces and from the bulk regions are of the same order of magnitude [9]. Recently, it was demonstrated within the framework of the 14-band Kane model that the interface spin-orbit terms are substantial in the Luttinger 4 × 4 Hamiltonian for 2D holes in GaAs quantum wells [15].…”

Section: Introductionmentioning

confidence: 99%

Effective one-band approach for the spin splittings in quantum wells

Alekseev

Nestoklon

2017

Phys. Rev. B

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The spin-orbit interaction of 2D electrons in the quantum wells grown from the III-V semiconductors consists of the two parts with different symmetry: the Bychkov-Rashba and the Dresselhaus terms. The last term is usually attributed to the bulk spin-orbit Hamiltonian which reflects the Td symmetry of the zincblende lattice. While it is known that the quantum well interfaces may also contribute to the Dresselhaus term, the exact structure and the relative importance of the interface and the bulk contributions are not well understood yet. To compare the bulk contribution with the interface one, we perform tight-binding calculations of the spin splittings of the electron levels in [100] GaAs/AlGaAs quantum wells and analyze the obtained spin splittings within the one-band effective mass electron Hamiltonian containing the two interface contributions to the Dresselhaus term. We show that the dependencies of the spin splittings on the quantum well width and the electric field along the growth direction are perfectly reproduced by the analytical one-band calculations and the magnitude of the interface contribution to the spin-orbit interaction for sufficiently narrow quantum wells is of the same order as the contribution from the bulk Dresselhaus Hamiltonian.Comment: 7 pages, 5 figure

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Spin relaxation of two-dimensional electrons in a hall ferromagnet

Cited by 22 publications

References 7 publications

Competing hyperfine and spin-orbit couplings: Spin relaxation in a quantum Hall ferromagnet

Competing hyperfine and spin-orbit couplings: Spin relaxation in a quantum Hall ferromagnet

Slow spin relaxation in a quantum Hall ferromagnet state

Effective one-band approach for the spin splittings in quantum wells

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