Inversion asymmetry spin splitting in self-assembled quantum rings

Alves, Fabrizio M.; Trallero‐Giner, C.; López‐Richard, V.; Marques, G. E.

doi:10.1103/physrevb.77.035434

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…Therefore, the net effect of H 1D + H R is to minimize the contribution from H 1D and decrease the values of ⌬ n,m ͑1͒ . 11 Moreover, the efficiency of the proposed spin-filter devices should decline for high impurity concentration or under strong current density injection where the electron-electron interaction be-comes important. The validity of our proposition is directly linked to the conservation of the wave vector k z .…”

Section: A Cylindrical Cross-section Confinementmentioning

confidence: 99%

“…The study of these systems allows us to understand the role played by dimensionality, 8 by electron-electron interaction, 9 as well as by size and shape quantization effects on their electronic properties. 10,11 In general, the Dresselhaus SOI coupling has been introduced to the electronic structure of nanostructures by taking the mean values of the wave-vector operators k z 2 and k z , as usually done in quantum dots 12 ͑QD's͒ or in a twodimensional ͑2D͒ electron gas in quantum wells ͑QW's͒. 4 In most cases, ͗k z ͘ = 0 and such approaches consider only effects due to in-plane k-linear terms proportional to the inplane k components ͑k x , k y ͒.…”

Section: Introductionmentioning

confidence: 99%

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Spin polarization in quantum wires: Influence of Dresselhaus spin-orbit interaction and cross-section effects

et al. 2009

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We examine the effects of the full Dresselhaus spin-orbit coupling on laterally confined quantum wire states. An analysis of the relative contributions due to linear, quadratic, and cubic Dresselhaus spin-orbit terms on the energy levels, spin splitting, and spin polarization has been carried out. The effects of wire cross-sectional geometry shapes on the electronic structure are explored. In particular we compared the results of semicylindrical and cylindrical confinements and have found important differences between the spin degeneracy of the ground-state level and the spin-polarization dependence on sign inversion of the free linear momentum quantum number along the wire axis. Different from other symmetries, in both cases here considered, the stronger spin-splitting effects come from the quadratic Dresselhaus term. We report ideal conditions for realization of spin-field filter devices based on symmetry properties of the spin splitting of the ground state in semicylindrical quantum wires.

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Section: A Cylindrical Cross-section Confinementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spin polarization in quantum wires: Influence of Dresselhaus spin-orbit interaction and cross-section effects

et al. 2009

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“…The nanoscale ring structures, or quantum rings (QRs), have attracted the interest of the scientific community due to their unique rotational symmetry and the possibility to verify quantum mechanical phenomena. [1,2,3] Among these, the study of Aharonov-Bohm (AB)like effects has gained a significant impetus, [4,5,6] and these efforts have gone beyond the original discussion of the AB interpretation on the nature of electromagnetic potentials and their role in quantum mechanics. [7] It is reasonable to say that the study of coherent interference occurring in transport properties of nanoscopic QRs, as proposed in Ref.…”

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confidence: 99%

“…[9] Thus, given an integer value for J, the parameter p can be determined uniquely in the interval (−1/2, 1/2]. Once we have determined p, we can solve the eigenvalue problem for χ under the boundary condition (3). The corresponding eigenfunctions can be determined exactly and the exciton energy obtained from a set of transcendental equations, as reported in Ref.…”

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confidence: 99%

“…[1,2,3] Among these, the study of Aharonov-Bohm (AB)-like effects has gained a significant impetus, [4,5,6] and these efforts have gone beyond the original discussion of the AB interpretation on the nature of electromagnetic potentials and their role in quantum mechanics. [7] It is reasonable to say that the study of coherent interference occurring in transport properties of nanoscopic QRs, as proposed in Ref.…”

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confidence: 99%

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Aharonov-Bohm Interference in Neutral Excitons: Effects of Built-In Electric Fields

et al. 2010

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We report a comprehensive discussion of quantum interference effects due to the finite structure of excitons in quantum rings and their first experimental corroboration observed in the optical recombinations. Anomalous features that appear in the experiments are analyzed according to theoretical models that describe the modulation of the interference pattern by temperature and built-in electric fields.PACS numbers: 71.35.Ji, 73.21.La, 78.20.Ls, 78.67.Hc The nanoscale ring structures, or quantum rings (QRs), have attracted the interest of the scientific community due to their unique rotational symmetry and the possibility to verify quantum mechanical phenomena.[1, 2, 3] Among these, the study of Aharonov-Bohm (AB)-like effects has gained a significant impetus, [4,5,6] and these efforts have gone beyond the original discussion of the AB interpretation on the nature of electromagnetic potentials and their role in quantum mechanics. [7] It is reasonable to say that the study of coherent interference occurring in transport properties of nanoscopic QRs, as proposed in Ref. 7 encounters, at the moment, serious scale limitations which has encouraged the search for optical implications associated to AB-effects.These endeavors applied to nanoscopic QRs do not strictly meet the original conditions for the ABconfiguration since the carriers are confined within regions with finite values of magnetic field. However, we still consider an observed effect as of AB-type if it can be explained assuming that the magnetic field is ideally concentrated in the middle of the QRs, i. e., when such effect comes essentially from potential vector-mediated quantum interference. As also considered in Ref. 8, in stationary systems this interference is generally reflected in a boundary condition and it is not as explicit as in the famous picture of an AB scattering situation.In this work we consider AB-interference in excitonic states as proposed theoretically in Refs. 9, 10, 12. Instead of looking only at the oscillatory dependence on magnetic flux of the electron-hole (e − h) recombination energy during photo-luminescence (PL), we also consider the excitonic oscillator strength whose oscillatory behavior reflects directly the changes in the exciton wavefunction as the magnetic flux increases. A similar experimental work was reported in Ref. 6 for type-II QRs, however, here we study type-I systems where both electron and hole move in the ring so that the correlation between them is crucial to the oscillatory behavior found in the PL integrated intensity. The samples studied here were grown using a RIBER 32P solid-source molecular beam epitaxy chamber and the QRs were grown using the following procedure. A 0.5 µm GaAs buffer layer was grown on semi-insulating (100) GaAs substrates at 580• C, after oxide desorption. Then, it was followed by 2.2 ML of InAs and the formation of quantum dots (QDs) at 520• C. The dots were obtained using the Stranski-Krastanov growth mode. Cycles of 0.14 ML of InAs plus a 2 s interruption under As 2 flux were r...

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