Characteristic molecular properties of one-electron double quantum rings under magnetic fields

Climente, Juan I.; Planelles, Josep

doi:10.1088/0953-8984/20/03/035212

Cited by 11 publications

(12 citation statements)

References 48 publications

(113 reference statements)

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“…Also, the inter-ring coupling is responsible for the reduction of persistent currents and magnetic dipole moments in a two-dimensional array of multiple QRs 19 and, as proposed in ref. 20 , even in the absence of the net flux Aharonov-Bohm oscillations can be obtained in QR molecules. In addition, calculations of persistent currents in a QRs modeled by the Holstein-Hubbard-Rashba 21 have demonstrated that the electron-phonon interactions reduce the persistent current, while the Rashba coupling enhances it and the temperature smoothens the persistent current curve.…”

Section: Introductionmentioning

confidence: 92%

Molecular spectrum of laterally coupled quantum rings under intense terahertz radiation

Baghramyan

Barseghyan

Laroze

2017

Sci Rep

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We study the influence of intense THz laser radiation and electric field on molecular states of laterally coupled quantum rings. Laser radiation shows the capability to dissociate quantum ring molecule and add 2-fold degeneracy to the molecular states at the fixed value of the overlapping size between rings. It is shown that coupled to decoupled molecular states phase transition points form almost a straight line with a slope equal to two. In addition, the electric field direction dependent energy spectrum shows unexpected oscillations, demonstrating strong coupling between molecular states. Besides, intraband absorption is considered, showing both blue and redshifts in its spectrum. The obtained results can be useful for the controlling of degeneracy of the discrete energy spectrum of nanoscale structures and in the tunneling effects therein.

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Section: Introductionmentioning

confidence: 92%

Molecular spectrum of laterally coupled quantum rings under intense terahertz radiation

Baghramyan

Barseghyan

Laroze

2017

Sci Rep

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“…33 Inter-ring tunneling for a single-electron states in a pair of laterally coupled InGaAs rings was recently studied. 29 The authors considered etched rings with very low indium concentration ͑5%͒ producing very shallow cavities of 50 meV depth. Even for rings that are so shallow, a very small inter-ring distances of 3 nm had to be assumed 29 for the discussion of the tunnel coupling.…”

Section: Theorymentioning

confidence: 99%

“…29 The authors considered etched rings with very low indium concentration ͑5%͒ producing very shallow cavities of 50 meV depth. Even for rings that are so shallow, a very small inter-ring distances of 3 nm had to be assumed 29 for the discussion of the tunnel coupling. The main results of the present paper were obtained for interring distance greater than 10 nm.…”

Section: Theorymentioning

confidence: 99%

“…Recently, states of a single electron in a pair of coplanar rings situated side by side were also studied. 29 The Coulomb interaction between coplanar InGaAs selfassembled quantum dots 30 of similar size does not produce any significant modification to the properties of confined system, since the single-particle states are frozen by the strong confinement. In fact, also the intradot interaction of confined electrons is only perturbative.…”

Section: Introductionmentioning

confidence: 99%

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Charged coplanar semiconductor quantum rings: Magnetization and inter-ring electron-electron correlation

Szafran

2008

Phys. Rev. B

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We study a coplanar system of electrostatically coupled semiconductor quantum rings each charged by a single electron using a configuration-interaction approach. We find that the electron densities confined in separate rings are significantly deformed by the inter-ring coupling which results in reduction of the persistent currents and the magnetic dipole moments that they generate, particularly at half flux quanta for which the persistent current loops are broken by appearance of zeros of angular single-ring wave functions. For three and more rings, the magnetic properties of the system strongly depend on the geometry of the ring configuration. We demonstrate a frustration mechanism which prevents the charge density deformation and reduction of the magnetization that occurs for rings near symmetry centers of the system. Due to this mechanism, the average magnetization produced by a linear array of rings exceeds several times the one generated by a square array. We discuss the nature of the electron-electron spatial inter-ring correlation. In the ground state, the correlation is semiclassical and can be reproduced by a separable wave function. Quantum correlation is weak and short range in the ground state. Excited states with longer range zigzag correlated structures formed in the internal degrees of freedom are also discussed.

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“…These experimental results claim the need to investigate how the coupling between the rings in CDQRs can be influenced both externally and internally. Internally, it has been demonstrated to be realizable by varying the inter-ring distance and aluminium concentration during the calculations of few-electron 20 and impurity-related linear and non-linear optical absorption spectrum 21 respectively, while externally it can be done by applying magnetic and electric fields 22 – 27 and with hydrostatic pressure 28 as well.…”

Section: Introductionmentioning

confidence: 99%

Modeling of anisotropic properties of double quantum rings by the terahertz laser field

Baghramyan

Barseghyan

Kirakosyan

et al. 2018

Sci Rep

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The rendering of different shapes of just a single sample of a concentric double quantum ring is demonstrated realizable with a terahertz laser field, that in turn, allows the manipulation of electronic and optical properties of a sample. It is shown that by changing the intensity or frequency of laser field, one can come to a new set of degenerated levels in double quantum rings and switch the charge distribution between the rings. In addition, depending on the direction of an additional static electric field, the linear and quadratic quantum confined Stark effects are observed. The absorption spectrum shifts and the additive absorption coefficient variations affected by laser and electric fields are discussed. Finally, anisotropic electronic and optical properties of isotropic concentric double quantum rings are modeled with the help of terahertz laser field.

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Characteristic molecular properties of one-electron double quantum rings under magnetic fields

Cited by 11 publications

References 48 publications

Molecular spectrum of laterally coupled quantum rings under intense terahertz radiation

Molecular spectrum of laterally coupled quantum rings under intense terahertz radiation

Charged coplanar semiconductor quantum rings: Magnetization and inter-ring electron-electron correlation

Modeling of anisotropic properties of double quantum rings by the terahertz laser field

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