Ultraviolet-laser atom-probe tomographic three-dimensional atom-by-atom mapping of isotopically modulated Si nanoscopic layers

Moutanabbir, Oussama; Isheim, Dieter; Seidman, David N.; Kawamura, Yōko; Itoh, Kohei M.

doi:10.1063/1.3531816

Cited by 40 publications

(35 citation statements)

References 19 publications

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“…Values stated in the table represent the reciprocal of the slope. We also tested alternative possibilities of profile fitting, as for example spline-fitting 11 or error functions. Because of the difficulty in separating the Cu(Ni) alloy from the interface (see composition profile of the annealed sample in Fig.…”

Section: -mentioning

confidence: 99%

“…Accurate analysis of multilayer interfaces with APT is nowadays well established 5 even with isotope multilayers. 10,11 The goal of this work is to verify the kinetic interface sharpening 6,7 by a truly atomistic method, by which the interface diffuseness can be clearly separated from any other phenomena. We chose the Ni/Cu system since it is miscible at the 773 K annealing temperature, well known to have an asymmetry in partial mobilities, and representing one of the earliest demonstrations of a Kirkendall-shift 12 and a nonFickian dissolution kinetics, 13 too.…”

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confidence: 99%

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Interface sharpening in miscible Ni/Cu multilayers studied by atom probe tomography

Balogh

Chellali

Greiwe

et al. 2011

Applied Physics Letters

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Interfaces of Ni/Cu multilayers were studied by atom probe tomography. To this aim, specimens with sharp or artificially smeared interfaces were prepared and investigated before and after annealing at 773 K. Owing to three-dimensional subnanometer resolution of the atom probe, local chemical analysis of layer interfaces becomes possible without interferences of grain boundaries or geometric roughness. In contrast to the classical expectation for a miscible system, but in agreement with more recent theoretical considerations, diffusion reduces the chemical width of the interfaces by up to 50%.

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Section: -mentioning

confidence: 99%

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confidence: 99%

Interface sharpening in miscible Ni/Cu multilayers studied by atom probe tomography

Balogh

Chellali

Greiwe

et al. 2011

Applied Physics Letters

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“…Therefore, a study of the UV laser's interaction with UO 2 is of key importance to understand how UO 2 performs in APT. Recent literature has reported a correlation between the wavelength of the laser and the band gap of the material and a consequent effect on the evaporation characteristics [27][28][29][30]. For the laser to assist in evaporation, its photon energy must be greater to or equal to the band gap energy the material to obtain full absorbance of the laser energy.…”

Section: Methodsmentioning

confidence: 98%

Influence of instrument conditions on the evaporation behavior of uranium dioxide with UV laser-assisted atom probe tomography

Valderrama

Henderson

Gan

et al. 2015

Journal of Nuclear Materials

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“…Isotopic modulation of silicon nanowires has already been demonstrated in Ref. 77. Additional electrostatic gates make it possible to localize a single electron with wavefunction centered at the island of nuclear spins, see Fig.…”

Section: -74mentioning

confidence: 99%

Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve

Chesi

Coish

2015

Phys. Rev. B

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We have theoretically analyzed coherent nuclear-spin dynamics induced by electron transport through a quantum-dot spin valve. The hyperfine interaction between electron and nuclear spins in a quantum dot allows for the transfer of angular momentum from spin-polarized electrons injected from ferromagnetic or half-metal leads to the nuclear spin system under a finite voltage bias. Accounting for a local nuclear-spin dephasing process prevents the system from becoming stuck in collective dark states, allowing a large nuclear polarization to be built up in the long-time limit. After reaching a steady state, reversing the voltage bias induces a transient current response as the nuclear polarization is reversed. Long-range nuclear-spin coherence leads to a strong enhancement of spinflip transition rates (by an amount proportional to the number of nuclear spins) and is revealed by an intense current burst, analogous to superradiant light emission. The crossover to a regime with incoherent spin flips occurs on a relatively long time scale, on the order of the single-nuclearspin dephasing time, which can be much longer than the time scale for the superradiant current burst. This conclusion is confirmed through a general master equation. For the two limiting regimes (coherent/incoherent spin flips) the general master equation recovers our simpler treatment based on rate equations, but is also applicable at intermediate dephasing. Throughout this work we assume uniform hyperfine couplings, which yield the strongest coherent enhancement. We propose realistic strategies, based on isotopic modulation and wavefunction engineering in core-shell nanowires, to realize this analytically solvable "box-model" of hyperfine couplings.

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Ultraviolet-laser atom-probe tomographic three-dimensional atom-by-atom mapping of isotopically modulated Si nanoscopic layers

Cited by 40 publications

References 19 publications

Interface sharpening in miscible Ni/Cu multilayers studied by atom probe tomography

Interface sharpening in miscible Ni/Cu multilayers studied by atom probe tomography

Influence of instrument conditions on the evaporation behavior of uranium dioxide with UV laser-assisted atom probe tomography

Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve

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