Impurity effects on the Aharonov-Bohm optical signatures of neutral quantum-ring magnetoexcitons

Silva, Luis G. G. V. Dias da; Ulloa, Sergio E.; Govorov, Alexander O.

doi:10.1103/physrevb.70.155318

Cited by 61 publications

(61 citation statements)

References 27 publications

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“…21,23,25 This discrepancy could be resolved if the disorder of the system and finite temperature were taken into account. [35][36][37] In our study we do not consider the disorder effect, which would modify our calculated results about the peak intensity of photoluminescence. On the other hand, our results about the peak position should not be changed qualitatively by the disorder.…”

Section: 25mentioning

confidence: 99%

Optical Aharonov-Bohm effect on Wigner molecules in type-II semiconductor quantum dots

2011

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We theoretically examine the magnetoluminescence from a trion and a biexciton in a type-II semiconductor quantum dot, in which holes are confined inside the quantum dot and electrons are in a ring-shaped region surrounding the quantum dot. First, we show that two electrons in the trion and biexciton are strongly correlated to each other, forming a Wigner molecule: Since the relative motion of electrons is frozen, they behave as a composite particle whose mass and charge are twice those of a single electron. As a result, the energy of the trion and biexciton oscillates as a function of magnetic field with half the period of the single-electron Aharonov-Bohm oscillation. Next, we evaluate the photoluminescence. Both the peak position and peak height change discontinuously at the transition of the many-body ground state, implying a possible observation of the Wigner molecule by the optical experiment.

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Section: 25mentioning

confidence: 99%

Optical Aharonov-Bohm effect on Wigner molecules in type-II semiconductor quantum dots

2011

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“…Theoretical studies 3,6,8,13 on one dimensional rings predict that for a quantum ring whose radial size is comparable to the exciton Bohr radius (i.e. in the weakly bound regime), the ground state energy could display nonvanishing AB oscillations.…”

Section: Introductionmentioning

confidence: 99%

Tunable optical Aharonov-Bohm effect in a semiconductor quantum ring

Peeters

2011

Phys. Rev. B

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By applying an electric field perpendicular to a semiconductor quantum ring we show that it is possible to modify the single particle wave function between quantum dot (QD)-like to ring-like. The constraints on the geometrical parameters of the quantum ring to realize such a transition are derived. With such a perpendicular electric field we are able to tune the Aharanov-Bohm (AB) effect for both single particles and for excitons. The tunability is in both the strength of the AB-effect as well as in its periodicity. We also investigate the strain induce potential inside the self assembled quantum ring and the effect of the strain on the AB effect.

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“…Last, we expect that the effects of external electric fields 20,31,36 and the formation of charged excitons remain similarly robust in 2D, whereas disorder effects 24,37,38 should be less important than in the 1D case.…”

Section: Discussionmentioning

confidence: 99%

“…20 Intermediate models assume twodimensional (2D) rings with narrow width under harmonic confinement and Coulomb-like interaction potentials between the electron and the hole, 21,22 or radial-polarized excitons when electrons and holes move in different circles. [23][24][25] The excitonic AB effect in 2D rings has been studied in models with harmonic 26 and geometric 15,27,28 confining potential or using a 2D attractive annular Hubbard model. 29,30 In all cases, the excitonic AB effect for neutral excitons has been argued to be suppressed in 2D as the width of the ring is increased.…”

Section: Introductionmentioning

confidence: 99%

Excitonic Aharonov-Bohm effect in a two-dimensional quantum ring

2011

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We study theoretically the optical properties of an exciton in a two-dimensional ring threaded by a magnetic flux. We model the quantum ring by a confining potential that can be continuously tuned from strictly one-dimensional to truly two-dimensional with finite radius-to-width ratio. We present an analytic solution of the problem when the electron-hole interaction is short ranged. The oscillatory dependence of the oscillator strength as a function of the magnetic flux is attributed to the Aharonov-Bohm effect. The amplitude of the oscillations changes upon increasing the width of the quantum ring. We find that the Aharonov-Bohm oscillations of the ground state of the exciton decrease with increasing the width, but, remarkably, the amplitude remains finite down to radius-to-width ratios less than unity. We attribute this resilience of the excitonic oscillations to the nonsimple connectedness of our chosen confinement potential with its centrifugal core at the origin.

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Impurity effects on the Aharonov-Bohm optical signatures of neutral quantum-ring magnetoexcitons

Cited by 61 publications

References 27 publications

Optical Aharonov-Bohm effect on Wigner molecules in type-II semiconductor quantum dots

Optical Aharonov-Bohm effect on Wigner molecules in type-II semiconductor quantum dots

Tunable optical Aharonov-Bohm effect in a semiconductor quantum ring

Excitonic Aharonov-Bohm effect in a two-dimensional quantum ring

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