Driving Spin and Charge in Quantum Wells by Surface Acoustic Waves

Wanner, Johannes; Gorini, Cosimo; Schwab, Peter; Eckern, Ulrich

doi:10.1002/admi.201400181

Cited by 3 publications

(2 citation statements)

References 33 publications

(58 reference statements)

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“…Finally, we note that it will be interesting to apply the present formalism to the theoretical analysis of surface acoustic wave experiments as done recently in Ref. 83.…”

Section: Discussionmentioning

confidence: 85%

Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids

2014

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Spin-orbit interactions in two-dimensional electron liquids are responsible for many interesting transport phenomena in which particle currents are converted to spin polarizations and spin currents and viceversa. Prime examples are the spin Hall effect, the Edelstein effect, and their inverses. By similar mechanisms it is also possible to partially convert an optically induced electron-hole density wave to a spin density wave and viceversa. In this paper we present a unified theoretical treatment of these effects based on quantum kinetic equations that include not only the intrinsic spin-orbit coupling from the band structure of the host material, but also the spin-orbit coupling due to an external electric field and a random impurity potential. The drift-diffusion equations we derive in the diffusive regime are applicable to a broad variety of experimental situations, both homogeneous and non-homogeneous, and include on equal footing "skew scattering" and "side-jump" from electronimpurity collisions. As a demonstration of the strength and usefulness of the theory we apply it to the study of several effects of current experimental interest: the inverse Edelstein effect, the spin-current swapping effect, and the partial conversion of an electron-hole density wave to a spin density wave in a two-dimensional electron gas with Rashba and Dresselhaus spin-orbit couplings, subject to an electric field.

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“…Finally, we note that it will be interesting to apply the present formalism to the theoretical analysis of surface acoustic wave experiments as done recently in Ref. 83.…”

Section: Discussionmentioning

confidence: 85%

Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids

2014

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“…In summary, we have demonstrated via simulations that SAWs applied to p-doped GaAs extend the minoritycarrier (electron) lifetimes by over an order of magnitude. Importantly for the applications in spin-polarized electron sources, the extension of electron lifetimes is accompanied by extension of their polarization lifetimes, as seen in an experiment 14 . Further calculations predict that the QE of GaAs PCs would increase by a factor of 2 -3 depending on the device geometry and NEA coating properties.…”

Section: Discussionmentioning

confidence: 99%

Enhancement of Photoemission on p-Type GaAs Using Surface Acoustic Waves

Dong

Afanasev

Johnson

et al. 2020

Sensors

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We demonstrate that photoemission properties of GaAs photocathodes (PCs) can be altered by surface acoustic waves (SAWs) generated on the PC surface due to dynamical piezoelectric fields of SAWs. Simulations with COMSOL indicate that electron effective lifetime in p-doped GaAs may increase by a factor of 10x to 20x. It implies a significant, by a factor of 2x to 3x, increase of quantum efficiency (QE) for GaAs PCs. Essential steps in device fabrication are demonstrated, including deposition of an additional layer of ZnO for piezoelectric effect enhancement, measurements of I-V characteristic of the SAW device, and ability to survive high-temperature annealing.

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Interference and multiparticle effects in a Mach-Zehnder interferometer with single-particle sources

et al. 2015

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We investigate a Mach-Zehnder interferometer fed by two time-dependently driven single-particle sources, one of them placed in front of the interferometer, the other in the centre of one of the arms. As long as the two sources are operated independently, the signal at the output of the interferometer shows an interference pattern, which we analyse in the spectral current, in the charge and energy currents, as well as in the charge current noise. The synchronisation of the two sources in this specifically designed setup allows for collisions and absorptions of particles at different points of the interferometer, which have a strong impact on the detected signals. It introduces further relevant time-scales and can even lead to a full suppression of the interference in some of the discussed quantities. The complementary interpretations of this phenomenon in terms of spectral properties and tuneable two-particle effects (absorptions and quantum exchange effects) are put forward in this article.

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Driving Spin and Charge in Quantum Wells by Surface Acoustic Waves

Cited by 3 publications

References 33 publications

Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids

Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids

Enhancement of Photoemission on p-Type GaAs Using Surface Acoustic Waves

Interference and multiparticle effects in a Mach-Zehnder interferometer with single-particle sources

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