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Träfflista för sökning "WFRF:(Khrebtov A. I.) "

Search: WFRF:(Khrebtov A. I.)

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1.
  • Askinazi, L. G., et al. (author)
  • Evolution of geodesic acoustic mode in ohmic H-mode in TUMAN-3M tokamak
  • 2012
  • In: Technical physics letters. - 1063-7850 .- 1090-6533. ; 38:3, s. 268-271
  • Journal article (peer-reviewed)abstract
    • The behavior of a geodesic acoustic mode (GAM) in the TUMAN-3M tokamak has been experimentally studied using the heavy-ion beam probing technique. Oscillations of the electric potential under the action of a GAM localized at the plasma periphery have been detected. The GAM was observed in the regime of low confinement (L-mode) with low plasma density (similar to 0.8 x 10(19) m(-3)) and disappeared upon the transition to a high confinement regime (H-mode). The possible role of GAM as a precursor of the improved confinement (LH-transition) is discussed.
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3.
  • Bouravleuv, A. D., et al. (author)
  • Electronic structure of (In, Mn) As quantum dots buried in GaAs investigated by soft-x-ray ARPES
  • 2016
  • In: Nanotechnology. - : IOP Publishing. - 0957-4484 .- 1361-6528. ; 27:42
  • Journal article (peer-reviewed)abstract
    • Electronic structure of a molecular beam epitaxy-grown system of (In, Mn) As quantum dots (QDs) buried in GaAs is explored with soft-x-ray angle-resolved photoelectron spectroscopy (ARPES) using photon energies around 1 keV. This technique, ideally suited for buried systems, extends the momentum-resolving capabilities of conventional ARPES with enhanced probing depth as well as elemental and chemical state specificity achieved with resonant photoexcitation. The experimental results resolve the dispersive energy bands of the GaAs substrate buried in similar to 2 nm below the surface, and the impurity states (ISs) derived from the substitutional Mn atoms in the (In, Mn) As QDs and oxidized Mn atoms distributed near the surface. An energy shift of the Mn ISs in the QDs compared to (In, Mn) As DMS is attributed to the band offset and proximity effect at the interface with the surrounding GaAs. The absence of any ISs in the vicinity of the VBM relates the electron transport in (In, Mn) As QDs to the prototype (In, Mn) As diluted magnetic semiconductor. The SX-ARPES results are supported by measurements of the shallow core levels under variation of probing depth through photon energy. X-ray absorption measurements identify significant diffusion of interstitial Mn atoms out of the QDs towards the surface, and the role of magnetic circular dichroism is to block the ferromagnetic response of the (In, Mn) As QDs. Possible routes are drawn to tune the growth procedure aiming at practical applications of the (In, Mn) As based systems.
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