Excitons in quantum-ring structures in a magnetic field: optical properties and persistent currents

Govorov, Alexander O.; Kalameitsev, A. V.; Warburton, Richard J.; Karraï, K.; Ulloa, Sergio E.

doi:10.1016/s1386-9477(01)00542-2

Cited by 33 publications

(31 citation statements)

References 10 publications

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“…The same underlying principle applies in the study of the PL response in semiconductor quantum dots with type-II band alignment. 12,13,19 An enhancement of the ABE is also predicted when an in-plane electric field is applied.…”

Section: 7mentioning

confidence: 73%

“…This represents the selection rules on the electron emission. 10,11,12 If the exciton is on state |Ψ exct i , the emission intensity I i is then given by:…”

Section: Pl Emission Intensitymentioning

confidence: 99%

“…The optical manifestations of such excitonic Aharonov-Bohm effect in semiconductor quantumring structures has received great attention from both theoretical 4,5,6,7,8,9,10,11,12,13,14,15 and experimental 16,17,18 groups. Whereas one could imagine that no ABE should be expected for neutral particles, a small but non-vanishing ABE in neutral excitons confined in one-dimensional rings was theoretically proposed.…”

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confidence: 99%

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

2004

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We study the role of impurity scattering on the photoluminescence (PL) emission of polarized magnetoexcitons. We consider systems where both the electron and hole are confined on a ring structure (quantum rings) as well as on a type-II quantum dot. Despite their neutral character, excitons exhibit strong modulation of energy and oscillator strength in the presence of magnetic fields. Scattering impurities enhance the PL intensity on otherwise "dark" magnetic field windows and non-zero PL emission appears for a wide magnetic field range even at zero temperature. For higher temperatures, impurity-induced anticrossings on the excitonic spectrum lead to unexpected peaks and valleys on the PL intensity as function of magnetic field. Such behavior is absent on ideal systems and can account for prominent features in recent experimental results.

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Section: 7mentioning

confidence: 73%

“…This represents the selection rules on the electron emission. 10,11,12 If the exciton is on state |Ψ exct i , the emission intensity I i is then given by:…”

Section: Pl Emission Intensitymentioning

confidence: 99%

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confidence: 99%

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

2004

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“…The optical AB effect in a quantum ring can be enhanced when the exciton is radially polarized, either by the application of an external electric field [9][10][11] or due to a radial asymmetry in the effective confinement for electrons and holes [6][7][8] . 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.…”

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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“…This results in an additional, diamagnetic term proportional to B 2 , which we ignore here similarly to the experimental papers. 4,7,8,[15][16][17] Certainly, the most drastic assumption seems to be the δ-function potential for the two-particle interaction. Its use is of course motivated by our resulting ability to reduce the computational difficulties as we will show below.…”

Section: Solution Of the Excitonic Casementioning

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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Excitons in quantum-ring structures in a magnetic field: optical properties and persistent currents

Cited by 33 publications

References 10 publications

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

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

Tunable optical Aharonov-Bohm effect in a semiconductor quantum ring

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

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