Stabilization of the Electron-Nuclear Spin Orientation in Quantum Dots by the Nuclear Quadrupole Interaction

Dzhioev, R. I.; Korenev, V. L.

doi:10.1103/physrevlett.99.037401

Cited by 81 publications

(97 citation statements)

References 15 publications

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“…Finally, we mention two possible directions for future research. First, parameter-free fitting of existing experiments 20 and inclusion of other interactions and effects beyond our simple model, e.g., the nuclear quadrupole interaction 21 and the "frequency focusing" effect 4,13 (which may be involved in the two-pump setup of Xu et al 6 ). Second, our theory can also be applied to the electron spin interacting with the nuclear spins through the non-collinear HI 20 (see Appendix A for details), e.g., in phosphorus donor in silicon 12 …”

Section: Discussionmentioning

confidence: 99%

Collective nuclear stabilization in single quantum dots by noncollinear hyperfine interaction

Yang

Sham

2012

Phys. Rev. B

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We present a theory of efficient suppression of the collective nuclear spin fluctuation which prolongs the electron spin coherence time through the non-collinear hyperfine interaction between the nuclear spins and the hole spin. This provides a general paradigm to combat decoherence by direct control of environmental noise, and a possible solution to the puzzling observation of symmetric broadening of the absorption spectra in two recent experiments [X. Xu et al., Nature 459, 1105

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Section: Discussionmentioning

confidence: 99%

Collective nuclear stabilization in single quantum dots by noncollinear hyperfine interaction

Yang

Sham

2012

Phys. Rev. B

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“…Nuclear spin depolarization can occur via flip-flops between interacting (neighboring) nuclei, giving rise to nuclear spin diffusion. However, in most QDs the nuclear Zeeman splitting matching required for such nuclear-nuclear flip-flops is not fulfilled owing to quadrupole interactions occurring mainly as a result of strain 13,19,60,[64][65][66] . Thus nuclear spin diffusion is typically suppressed in QDs 36,60,61,63 .…”

Section: Dynamic Nuclear Polarizationmentioning

confidence: 99%

Nuclear spin effects in semiconductor quantum dots

et al. 2013

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“…12 The existing negative sentiments for the strain in the context of electron and nuclear spin dynamics have been dramatically reversed by the work of Dzhioev and Korenev. 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.…”

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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Stabilization of the Electron-Nuclear Spin Orientation in Quantum Dots by the Nuclear Quadrupole Interaction

Cited by 81 publications

References 15 publications

Collective nuclear stabilization in single quantum dots by noncollinear hyperfine interaction

Collective nuclear stabilization in single quantum dots by noncollinear hyperfine interaction

Nuclear spin effects in semiconductor quantum dots

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

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