In(Ga)As self-assembled quantum ring formation by molecular beam epitaxy

Granados, Daniel; Garcı́a, J.M.

doi:10.1063/1.1566799

Cited by 203 publications

(163 citation statements)

References 18 publications

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“…The inner and outer radii are set 1 = 10 nm and 2 = 26 nm, respectively. 3 The effective Bohr radius is found to be a * = 10 nm, and the magnetic length is given by l m = ͑26/ ͱ B͒ nm, where B is expressed in tesla. The effective Rydberg is R y * = 5.4 meV in this material system.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Donor-bound electrons in quantum rings under magnetic fields

et al. 2007

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We theoretically study donor-bound electron states in two-dimensional quantum rings of finite width. A strong magnetic field is applied perpendicular to the plane of the quantum ring. The resulting electronic states are obtained within the effective-mass approximation. For on-center donors, the radial Hamiltonian for the envelope function is exactly diagonalized, and the corresponding energy levels for different angular momenta are studied as a function of the applied magnetic field. Confinement properties change rapidly with the external magnetic field. An abrupt change of the localization properties appears at a critical magnetic field, since the electron is mainly localized around the impurity. This transition gives rise to well-defined anticrossing of levels as a function of the magnetic field. Intraband transitions are found to carry relevant information of these confining properties of the rings.

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Section: Numerical Resultsmentioning

confidence: 99%

“…[1][2][3] QRs are small semiconductor ring-shape structures in which electrons are confined in all spatial dimensions. As a consequence, discreteness of energy and charge arises, such as in atomic systems.…”

Section: Introductionmentioning

confidence: 99%

Donor-bound electrons in quantum rings under magnetic fields

et al. 2007

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“…9 The dot-to-ring transition has been attributed to a dewetting process which expels the indium from the QD 19 and a simultaneous strongly temperature dependent Ga-In alloying process. 13 Capacitance and far-infrared spectroscopy on SAQRs have provided evidence of an Aharonov-Bohm oscillation. 10 Measurements of the vertical Stark effect of excitons confined to individual SAQRs 12 have shown comparatively large electric dipole moments with sign opposite to that in quantum dots.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5] The first experimental evidence of Aharonov-Bohm oscillations was found in metallic 6,7 and semiconductor 8 rings in the mesoscopic regime. In recent years, the fabrication and the investigation of In x Ga 1−x As self-assembled quantum rings ͑SAQRs͒ have been rapidly progressing and led to a large number of experimental [9][10][11][12][13][14] and theoretical [15][16][17][18] studies.…”

Section: Introductionmentioning

confidence: 99%

Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembledInxGa1−xAsquantum rings in GaAs

et al. 2007

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Citation for published version (APA):Fomin, V. M., Gladilin, V. N., Klimin, S. N., Devreese, J. T., Kleemans, N. A. J. M., & Koenraad, P. M. (2007). Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembled Inx Ga1-x As quantum rings in GaAs. Physical Review B, 76(23) Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembled In x Ga 1−x As quantum rings in GaAs We analyze theoretically the electron energy spectrum and the magnetization of an electron in a strained In x Ga 1−x As/ GaAs self-assembled quantum ring ͑SAQR͒ with realistic parameters, determined from the crosssectional scanning-tunneling microscopy characterization of that nanostructure. The SAQRs have an asymmetric indium-rich craterlike shape with a depression rather than an opening at the center. Although the real SAQR shape differs strongly from an idealized circular-symmetric open ring structure, the Aharonov-Bohm oscillations of the magnetization survive.

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“…Then the implementation of full single-qubit manipulation requires tunable external magnetic fields and the architecture of the system must be elaborately designed. 11,12 Nowadays, benefiting from new fabrication and experiment techniques we can fabricate ringlike quantum dot, namely nanoring, with various materials, such as InAs/GaAs, 13,14,15,16 Si, 17,18 SiGe, 19,20 and so on 21 . Its ringlike geometry is suitable for observing AharonovBohm (AB) effect.…”

Section: Introductionmentioning

confidence: 99%

Aharonov-Bohm phase operations on a double-barrier nanoring charge qubit

Wang

Zhu

2006

Phys. Rev. B

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We present a scheme for charge qubit implementation in a double-barrier nanoring. The logical states of the qubit are encoded in the spatial wavefunctions of the two lowest energy states of the system. The Aharonov-Bohm phase introduced by magnetic flux, instead of tunable tunnelings, along with electric fields can be used for implementing the quantum gate operations. During the operations, the external fields should be switched smoothly enough to avoid the errors caused by the transition to higher-lying states. The structure and field effects on the validity of the qubit are also studied.

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In(Ga)As self-assembled quantum ring formation by molecular beam epitaxy

Cited by 203 publications

References 18 publications

Donor-bound electrons in quantum rings under magnetic fields

Donor-bound electrons in quantum rings under magnetic fields

Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembledInxGa1−xAsquantum rings in GaAs

Aharonov-Bohm phase operations on a double-barrier nanoring charge qubit

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