From Spin Flip Excitations to the Spin Susceptibility Enhancement of a Two-Dimensional Electron Gas

Pérez, Florent; Aku-Leh, C.; Richards, David; Jusserand, B.; Smith, L. C.; Wolverson, Daniel; Karczewski, G.

doi:10.1103/physrevlett.99.026403

Cited by 40 publications

(60 citation statements)

References 26 publications

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“…17 It makes it a suitable system to study features of spin-resolved Coulomb interaction. 8,18 The above approach was followed in our previous work to study spin excitations of the spinpolarized 2DEG (SP2DEG). 8,16,17,19 .…”

Section: Introductionmentioning

confidence: 99%

Dynamical corrections to spin-wave excitations in quantum wells due to Coulomb interactions and magnetic ions

et al. 2011

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We have measured dispersions of spin-flip waves and spin-flip single-particle excitations of a spin polarized two-dimensional electron gas in a Cd1−xMnxTe quantum well using resonant Raman scattering. We find the energy of the spin-flip wave to be below the spin-flip single particle excitation continuum, a contradiction to the theory of spin waves in diluted magnetic semiconductors put forth in [Phys. Rev. B 70 045205 (2004)]. We show that the inclusion of terms accounting for the Coulomb interaction between carriers in the spin wave propagator leads to an agreement with our experimental results. The dominant Coulomb contribution leads to an overall red shift of the mixed electron-Mn spin modes while the dynamical coupling between Mn ions results in a small blue shift. We provide a simulated model system which shows the reverse situation but at an extremely large magnetic field.

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Section: Introductionmentioning

confidence: 99%

Dynamical corrections to spin-wave excitations in quantum wells due to Coulomb interactions and magnetic ions

et al. 2011

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“…ILS [16,21] is a powerful tool to study spin excitations at a given transferred momentum q ( Fig. 2(a), inset) [20].…”

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confidence: 99%

Giant Collective Spin-Orbit Field in a Quantum Well: Fine Structure of Spin Plasmons

et al. 2012

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International audienceWe employ inelastic light scattering with magnetic fields to study intersubband spin plasmons in a quantum well. We demonstrate the existence of a giant collective spin-orbit (SO) field that splits the spin-plasmon spectrum into a triplet. The effect is remarkable as each individual electron would be expected to precess in its own momentum-dependent SO field, leading to D'yakonov-Perel' dephasing. Instead, many-body effects lead to a striking organization of the SO fields at the collective level. The macroscopic spin moment is quantized by a uniform collective SO field, five times higher than the individual SO field. We provide a momentum-space cartography of this field

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“…The influence of Coulomb interactions on the spin susceptibility and effective mass in two-dimensional electron and hole systems has been the subject of intense interest and speculation recently 1-3 with measurements suggesting a significant enhancement of the spin susceptibility at very lowdensities materials with small g-factors such as GaAs-based systems, 4-7 CdTe, 8 and silicon. 9,10 Such an effect is a key signature of many-body effects and has been studied theoretically for many years, however, to date only a few of the experimental analysis techniques have considered the influence of the changing spin polarization on the observed properties, 6,8 as pointed out theoretically.…”

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confidence: 99%

Giant enhanced g-factors in an InSb two-dimensional gas

et al. 2009

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We report measurements of the electron g-factor in InSb quantum wells using the coincidence technique, polarization transition, and temperature-dependent resistivity. All three methods show that there is a giant enhancement of the spin slitting which is proportional to the spin polarization. Electron Zeeman energies as high as 51 meV are measured leading to the conclusion that the additional contribution to the spin splitting is of order 30 meV, more than ten times larger than expected from conventional theories.

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From Spin Flip Excitations to the Spin Susceptibility Enhancement of a Two-Dimensional Electron Gas

Cited by 40 publications

References 26 publications

Dynamical corrections to spin-wave excitations in quantum wells due to Coulomb interactions and magnetic ions

Dynamical corrections to spin-wave excitations in quantum wells due to Coulomb interactions and magnetic ions

Giant Collective Spin-Orbit Field in a Quantum Well: Fine Structure of Spin Plasmons

Giant enhanced g-factors in an InSb two-dimensional gas

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