Double-layered quantum dots in a magnetic field: The ground state and the far-infrared response

Mayrock, O.; Mikhaǐlov, S. A.; Darnhofer, T.; Rößler, U.

doi:10.1103/physrevb.56.15760

Cited by 16 publications

(9 citation statements)

References 30 publications

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“…4,5 Vertically coupled dots, also called artificial or quantum dot molecules, were theoretically addressed in a number of works. [22][23][24][25][26][27] Only in Ref. 22 was the z extension of the constituent QD's taken into account; in the other references, it was neglected, and consequently their results cannot be reliable when the interdot distance is comparable to their z extension, which is an interesting physical situation.…”

Section: Introductionmentioning

confidence: 99%

Vertically coupled quantum dots in the local spin-density functional theory

et al. 2001

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We have investigated the structure of double quantum dots vertically coupled at zero magnetic field within local-spin-density functional theory. The dots are identical and have a finite width, and the whole system is axially symmetric. We first discuss the effect of thickness on the addition spectrum of one single dot. Next we describe the structure of coupled dots as a function of the interdot distance for different electron numbers. Addition spectra, Hund's rule, and molecular-type configurations are discussed. It is shown that self-interaction corrections to the density-functional results do not play a very important role in the calculated addition spectra.

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Section: Introductionmentioning

confidence: 99%

Vertically coupled quantum dots in the local spin-density functional theory

et al. 2001

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“…Vertically coupled QD's of different radii have been described in Ref. 10 to address the sensitivity of the exchange coupling to the value of an in-plane applied electric field.…”

Section: Heteronuclear Qr Moleculesmentioning

confidence: 99%

Vertically coupled double quantum rings at zero magnetic field

et al. 2006

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Within local-spin-density functional theory, we have investigated the "dissociation" of few-electron circular vertical semiconductor double quantum ring artificial molecules at zero magnetic field as a function of interring distance. In a first step, the molecules are constituted by two identical quantum rings. When the rings are quantum mechanically strongly coupled, the electronic states are substantially delocalized, and the addition energy spectra of the artificial molecule resemble those of a single quantum ring in the few-electron limit. When the rings are quantum mechanically weakly coupled, the electronic states in the molecule are substantially localized in one ring or the other, although the rings can be electrostatically coupled. The effect of a slight mismatch introduced in the molecules from nominally identical quantum wells, or from changes in the inner radius of the constituent rings, induces localization by offsetting the energy levels in the quantum rings. This plays a crucial role in the appearance of the addition spectra as a function of coupling strength particularly in the weak coupling limit.

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“…All the same, these spin peaks arising at energies higher than those of the charge-density might not correspond to a genuine spin response, due to the relevant local magnetization of the system, and may correspond to the so-called acoustic modes. 36 In summary, we do have some elements allowing ͑i͒ to distinguish NDs from NRs in the transverse-spin response, ͑ii͒ to discriminate whether ND electrons are exclusively located in the caps or also in the central trunk ͑longitudinal high-energy response and presence or absence of peaks in its low-energy range͒, and finally ͑iii͒ to detect the Wigner phase in the ND trunk or in the NR: spectra fragmentation and absence of spin response at energies lower than those of the charge-density one ͑acoustic modes͒.…”

Section: Resultsmentioning

confidence: 99%

Mixed correlation phases in elongated quantum dots

et al. 2010

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It is theoretically shown, within the local spin-density-functional theory framework, that inhomogeneous confining potentials in elongated, diluted N-electron quantum dots may lead to the formation of mixed phases in which some regions of the N-electron system behave like a Fermi liquid while, simultaneously, other, more dilute regions display quasiclassical Wigner crystallization. The characterization of the mixed phases in the addition energy spectrum and the infrared response is reported. An infrared sensor of electron filling is suggested.

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Double-layered quantum dots in a magnetic field: The ground state and the far-infrared response

Cited by 16 publications

References 30 publications

Vertically coupled quantum dots in the local spin-density functional theory

Vertically coupled quantum dots in the local spin-density functional theory

Vertically coupled double quantum rings at zero magnetic field

Mixed correlation phases in elongated quantum dots

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