Determination of the Gradient-Elastic Tensors for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">III</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>Compounds Using Nuclear Acoustic Resonance

Sundfors, R. K.

doi:10.1103/physrev.177.1221

Cited by 29 publications

(14 citation statements)

References 18 publications

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“…32 Actually, several decades ago it was experimentally shown that anisotropic strain in a III-V crystal lattice causes local electric-field gradients (EFG) with which a spin-I nucleus with I 2 interacts because of its quadrupolar moment. [33][34][35] This quadrupolar interaction (QI) splits the nuclear spin degeneracy even in the absence of an external magnetic field; 36,37 hence it energetically suppresses the nuclear spin-flip events, stabilizing the electron spin orientation confined in the QD. 32 With this paradigm shift, strain is no longer just a nuisance but something to be exploited as a new degree of freedom to tailor the magnetic environment of InAs QDs.…”

Section: Introductionmentioning

confidence: 99%

Quadrupolar spectra of nuclear spins in strained InxGa1−xAs quantum dots

Bulutay

2012

Phys. Rev. B

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Self-assembled quantum dots (QDs) are born out of lattice mismatched ingredients where strain plays an indispensable role. Through the electric quadrupolar coupling, strain affects the magnetic environment as seen by the nuclear spins. To guide prospective single-QD nuclear magnetic resonance (NMR), as well as dynamic nuclear spin polarization experiments, an atomistic insight to the strain and quadrupolar field distributions is presented. A number of implications of the structural and compositional profile of the QD have been identified. A high aspect ratio of the QD geometry enhances the quadrupolar interaction. The inclined interfaces introduce biaxiality and the tilting of the major quadrupolar principal axis away from the growth axis; the alloy mixing of gallium into the QD enhances both of these features while reducing the quadrupolar energy. Regarding the NMR spectra, both Faraday and Voigt geometries are investigated, unraveling in the first place the extend of inhomogeneous broadening and the appearance of the normally forbidden transitions. Moreover, it is shown that from the main extend of the NMR spectra the alloy mole fraction of a single QD can be inferred. By means of the element-resolved NMR intensities it is found that In nuclei has a factor of 5 dominance over those of As. In the presence of an external magnetic field, the borderlines between the quadrupolar and Zeeman regimes are extracted as 1.5 T for In and 1.1 T for As nuclei. At these values the nuclear spin depolarization rates of the respective nuclei get maximized due to the noncollinear secular hyperfine interaction with a resident electron in the QD.

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Section: Introductionmentioning

confidence: 99%

Quadrupolar spectra of nuclear spins in strained InxGa1−xAs quantum dots

Bulutay

2012

Phys. Rev. B

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“…Однако вследствие недостаточной чувствительности метод прямого, акустического ЯМР не нашел широкого применения и акустический резо-нанс на ядерных спинах этим методом наблюдался в сравнительно неболь-шом количестве кристаллов: полупроводниках группы АшБу 9 , щелочно-галоидных кристаллах 6 и некоторых металлах 10 > п .…”

Section: успехи физических наукunclassified

“…Диапазон частот 3-20 Мгц перекрывался, изменением величины и направления постоянного магнитного поля Н относительно кристаллических осей. При AAlA m~ 5 измеряемые ампли-туды деформации составляют 7-Ю" 9 , что на два порядка меньше, чвш измеряемая E min в том же образце, но в отсутствие динамической поляриг-зации ядер. Поскольку степень поляризации пропорциональна^ hv/kT, 2*.…”

Section: гиперзвуковая голоднаunclassified

Double magnetoacoustic resonances in crystals

Golenishchev-Kutuzov¹,

Saburova²,

Shamukov³

1976

Usp. Fiz. Nauk

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“…al. have derived S ijkl for a wide range of materials [35][36][37][38] including GaAs and other III-V semiconductors. The experiments in these studies relied on measuring absorbtion of the acoustic waves rather than direct detection of the quadrupolar shifts in NMR spectra.…”

Section: Introductionmentioning

confidence: 99%

Cross calibration of deformation potentials and gradient-elastic tensors of GaAs using photoluminescence and nuclear magnetic resonance spectroscopy in GaAs/AlGaAs quantum dot structures

et al. 2018

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Lattice matched GaAs/AlGaAs epitaxial structures with quantum dots are studied under static uniaxial stress applied either along the [001] or [110] crystal directions. We conduct simultaneous measurements of the spectral shifts in the photoluminescence of the bulk GaAs substrate, which relate to strain via deformation potentials a and b, and the quadrupolar shifts in the optically detected nuclear magnetic resonance spectra of the quantum dots, which relate to the same strain via the gradient-elastic tensor S ijkl . Measurements in two uniaxial stress configurations are used to derive the ratio b/a = 0.241 ± 0.008 in good agreement with previous studies on GaAs. Based on the previously estimated value of a ≈ −8.8 eV we derive the product of the nuclear quadrupolar moment Q and the S-tensor diagonal component in GaAs to be QS11 ≈ +0.76×10 −6 V for 75 As and QS11 ≈ −0.37 × 10 −6 V for 69 Ga nuclei. In our experiments the signs of S11 are directly measurable, which was not possible in the earlier nuclear acoustic resonance studies. Our QS11 values are a factor of ∼1.4 smaller than those derived from the nuclear acoustic resonance experiments [Phys. Rev. B 10, 4244 (1974)]. The gradient-elastic tensor values measured in this work can be applied in structural analysis of strained III-V semiconductor nanostructures via accurate modelling of their magnetic resonance spectra. arXiv:1804.06879v2 [cond-mat.mes-hall] 1 May 2018

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Determination of the Gradient-Elastic Tensors forAIIIBVCompounds Using Nuclear Acoustic Resonance

Cited by 29 publications

References 18 publications

Quadrupolar spectra of nuclear spins in strained InxGa1−xAs quantum dots

Quadrupolar spectra of nuclear spins in strained InxGa1−xAs quantum dots

Double magnetoacoustic resonances in crystals

Cross calibration of deformation potentials and gradient-elastic tensors of GaAs using photoluminescence and nuclear magnetic resonance spectroscopy in GaAs/AlGaAs quantum dot structures

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